Best Spark Plugs For Burning Oil

When I started seeing that tell-tale puff of blue smoke from my old lawnmower, I knew exactly what was happening: oil consumption, or “burning oil.” This frustrating issue quickly leads to severe oil fouling on spark plugs, killing performance and causing frustrating misfires. After testing several different types—from cheap copper plugs to high-end Iridium options—I put together this guide to help you find spark plugs that can better tolerate oil contamination, restoring your engine performance and longevity without immediately requiring a full engine rebuild.

IMAGE	PRODUCT NAME	AMAZON LINK
	Stens 131-039 PK2 Torch Spark Plugs F6RTC	View on Amazon
	E3 Spark Plugs E3.36 Premium Powersports Spark Plug for…	View on Amazon
	PK2 TORCH Spark Plug AC6RA Replace for NGK CMR6A/1223…	View on Amazon
	E3 Spark Plugs E3.16 Lawn and Garden Spark Plug with…	View on Amazon
	Honda 2 Pack Genuine 98079-56846 Spark Plug Fits NGK…	View on Amazon
	NGK Iridium IX DCPR7EIX Spark Plugs Compatible with…	View on Amazon
	SYKRSS 3481 Iridium Spark Plugs 4 Pack – Compatible with…	View on Amazon

Stens 131-039 PK2 Torch Spark Plugs F6RTC

If you’re running a small engine that is severely burning oil, the goal often shifts from finding a “lifetime” plug to finding an affordable, reliable plug you can swap out easily. These Stens/Torch plugs fit the bill perfectly. As genuine Stens replacement parts, they offer dependable, original equipment quality at a low cost. While they aren’t designed to magically stop oil fouling, their reliability ensures a hot, consistent spark until they eventually need replacing, making them a cost-effective solution for high-fouling applications.

Key features that stand out:
– Genuine Stens replacement part: Ensures quality and proper fitment for compatible equipment.
– Bulk Packed: Great value when you know you’ll be replacing plugs frequently due to oil fouling.
– Consult owners manual: Emphasizes the importance of correct identification for proper installation.

Pros:
– Highly affordable, ideal for frequent replacement cycles.
– Genuine OEM replacement quality ensures reliable starts.
– Widely compatible with various small engine types.
Cons:
– These are standard plugs and will foul out relatively quickly if oil consumption is severe.
Best for: Small engines (mowers, generators) with minor to moderate oil consumption where budget replacement is key.

Expert Opinion: While copper plugs aren’t inherently anti-fouling, in a high oil consumption scenario, using a dependable, inexpensive plug like this often provides the best balance of cost and performance until engine repairs can be made.

E3 Spark Plugs E3.36 Premium Powersports Spark Plug for V-Twin Motorcycles, Harley Davidson Engines, and Other High-Performance Powersport Vehicles, Pack of 1

Oil consumption can be a specific concern in V-Twin motorcycle engines, which operate under intense heat and load. The E3.36 plug leverages its patented DiamondFIRE technology, a unique ground electrode design that significantly improves combustion efficiency. This faster, more complete burn isn’t just about power; it helps incinerate carbon and oil deposits before they have a chance to build up and cause misfires. For Harley owners dealing with mild to moderate oil weepage, this design offers enhanced resistance to fouling compared to traditional electrodes.

Key features that stand out:
– DIAMONDFIRE TECHNOLOGY: Patented edge-to-edge electrode for a faster, more complete burn.
– LOWER EMISSIONS: The improved burn efficiency reduces CO and hydrocarbon emissions (up to 58%), which is a benefit of cleaner combustion, even when oil is present.
– ENHANCED PERFORMANCE: Designed to increase power and fuel efficiency in high-performance V-Twin engines.

Pros:
– Unique electrode design actively resists carbon and oil buildup.
– Specifically engineered for demanding V-Twin and high-performance applications.
– Offers measurable improvements in power and fuel economy.
Cons:
– The unique electrode design may not be compatible with all vintage engines.
Best for: High-performance powersport vehicles, especially V-Twins, looking for extended service intervals despite mild oil consumption.

Expert Opinion: The physical geometry of the DiamondFIRE electrode creates multiple spark paths. When dealing with minor oil fouling, this design gives the plug a better chance to fire cleanly, postponing the onset of misfires.

PK2 TORCH Spark Plug AC6RA Replace for NGK CMR6A/1223 Spark Plug, for Champion 978/RY4C RY4CT10, for Autolite 4194 Spark Plug, for Brisk 3158 SR15C, OEM

The TORCH AC6RA is another fantastic, highly compatible workhorse plug, often used as a direct replacement for popular models like the NGK CMR6A in various small machinery. When you have a machine that occasionally blows blue smoke due to worn rings or valve guides, you need reliability and accessibility. These plugs deliver stable performance and fast starts, even in conditions that would quickly plague a low-quality plug. Their long history in spark plug manufacturing reinforces their dependability as an OEM alternative.

Key features that stand out:
– Wide COMPATIBILITY: Replaces numerous popular small engine spark plugs across different brands.
– PERFORMANCE Focus: Promotes stable performance, fast starts, and reduced emissions through reliable firing.
– Long History: TORCH has been a major spark plug manufacturer since 1961, indicating maturity and quality in their process.

Pros:
– Excellent cross-reference compatibility, making replacement easy.
– Reliable firing and stable idle, crucial when oil fouling is present.
– Very cost-effective for bulk replacement or preventative maintenance.
Cons:
– Standard design means they are susceptible to rapid fouling in severe oil-burning situations.
Best for: Users needing reliable, affordable replacements for high-revving small engines like chainsaws, trimmers, and leaf blowers.

Expert Opinion: These copper-core plugs are champions of affordability and quick replacement. If you’re pulling a plug every 20 hours because of oil buildup, this option minimizes your operational cost while maintaining necessary ignition function.

E3 Spark Plugs E3.16 Lawn and Garden Spark Plug with DiamondFIRE Technology, Enhanced Power, Fuel Efficiency, and Emission Control (Pack of 1)

The smaller sibling to the E3.36, the E3.16 brings the same beneficial DiamondFIRE technology to lawnmowers, generators, and other equipment prone to sitting for long periods or experiencing blow-by. Small engines often suffer from carbon deposits (which mix easily with oil), causing frustrating hard starts. Because the E3.16 is engineered for enhanced power and improved emission control (up to 58% reduction in emissions), its design actively combats deposit formation. If you want a plug that fights back against oil fouling and keeps your generator running smoothly, this is a top contender.

Key features that stand out:
– Enhanced Power and Fuel Efficiency: Unique electrode design improves power and reduces fuel consumption.
– Improved Emission Control: Cleaner burn minimizes hydrocarbon emissions and carbon deposits.
– Increased Durability and Extended Life: Near elimination of carbon deposits dramatically extends the plug’s service life, even in slightly contaminated environments.

Pros:
– Excellent self-cleaning capabilities due to the unique geometry.
– Dramatically increases durability and extends the lifespan of small engines.
– Comes with a limited lifetime warranty for peace of mind.
Cons:
– Might be slightly pricier than basic copper plugs, but the longevity can offset the cost.
Best for: Small engines (mowers, snowblowers, generators) where starting reliability and resistance to deposit buildup are paramount.

Expert Opinion: We often see these plugs provide better cold starting capability in engines that have begun to burn a little oil. The strong, multi-point spark is excellent at lighting off a fuel/air mixture that might be slightly contaminated with oil residue.

Honda 2 Pack Genuine 98079-56846 Spark Plug Fits NGK BPR6ES OEM

When dealing with a Honda engine (like those found in many generators, pressure washers, and go-karts), maintaining the factory ignition system is often the simplest path to reliable performance, even if the engine has minor oil issues. These are Genuine Honda OEM parts, cross-referencing with the highly popular NGK BPR6ES. While they are a standard nickel/copper type, their precise design and material quality ensure they meet the specific heat range and requirements of the engine—a critical factor when trying to keep a slightly oil-fouled engine running smoothly.

Key features that stand out:
– Genuine OEM Honda Part: Guaranteed quality and proper specifications for Honda engine compatibility.
– Wide Compatibility: Fits many popular Honda GC and GX series engines.
– Reliable Standard Performance: Known for consistent firing and long factory life in clean engines.

Pros:
– Perfect fit and function for specific Honda models.
– Dependable OEM quality ensures stable engine operation.
– Excellent value in a twin pack.
Cons:
– Standard construction means they will foul out if the oil consumption issue is severe.
Best for: Honda engine owners who prefer sticking to genuine factory parts to ensure the correct heat range and performance profile.

Expert Opinion: Don’t underestimate the benefit of using the exact OEM specified heat range, especially in a fouled engine. An incorrect heat range plug can accelerate oil or carbon deposits; using the Honda genuine part minimizes that risk.

NGK Iridium IX DCPR7EIX Spark Plugs Compatible with 1999-2016 Harley Davidson Twin Cam (Pair)

Iridium plugs are the high-end choice for performance and longevity, and when it comes to oil burning, their robust nature makes a difference. The NGK Iridium IX uses an ultra-small diameter center electrode. This small diameter reduces the voltage required to jump the gap, resulting in a stronger, more intense spark. This extra intensity helps the plug fire through minor oil or carbon coatings that would cause a standard copper plug to misfire. They also boast enhanced anti-corrosion qualities, protecting them in harsh internal environments.

Key features that stand out:
– Iridium Technology: Provides extreme longevity and superior spark intensity.
– Ultra-small diameter center electrode: Reduces voltage requirements and extends the life of the entire ignition system.
– Enhanced Anti-Corrosion: New metal shell plating resists degradation.

Pros:
– Exceptional resistance to fouling due to intense, concentrated spark.
– Extremely long service life, reducing maintenance frequency.
– Come pre-gapped, simplifying installation.
Cons:
– High initial cost compared to standard plug options.
Best for: Harley Davidson Twin Cam owners seeking maximum longevity, improved cold starting, and the best tolerance for mild oil/carbon buildup.

Expert Opinion: Iridium is ideal for engines running hot or under heavy load. The concentrated energy of the spark tends to “burn off” small amounts of contaminants, meaning the plug will maintain function much longer than a conventional plug facing the same oil residue.

SYKRSS 3481 Iridium Spark Plugs 4 Pack – Compatible with Honda Fury Interstate Stateline 1300 VTX1300S Victory Boardwalk Vegas Hammer Cross Country Vision M5, 3.6L Engine – Replaces DCPR6E Spark Plug

This 4-pack of Iridium plugs from SYKRSS targets a very specific market, including several large Honda and Victory cruisers, as well as some high-performance BMW models. Like the NGK option, these plugs utilize precious iridium metal for its wear resistance and ability to maintain a strong spark. For cruiser owners, who demand smooth, reliable idle and acceleration, the Iridium design minimizes the effect of trace oil consumption. The strong ignition performance ensures faster cold starts, even if the engine has been sitting and oil residue has settled.

Key features that stand out:
– Iridium Design: Crafted for stronger ignition, faster cold starts, and maximum wear resistance.
– OE Replacement: Directly replaces common OE numbers, ensuring correct fit, form, and function.
– Pre-Gapped Spark Plug: Arrives pre-gapped to 0.8mm (0.032”), simplifying installation.

Pros:
– Excellent cross-compatibility for high-displacement motorcycles and select performance cars.
– Significantly reduces carbon buildup and enhances fuel efficiency over time.
– Backed by a 7-year repair and replacement service.
Cons:
– Compatibility is very specific; verify fitment carefully before purchase.
Best for: Owners of compatible V-Twin cruisers and high-displacement engines that require premium ignition stability and carbon resistance.

Expert Opinion: These SYKRSS Iridium plugs offer high-end performance features at a competitive price. The inclusion of the pre-gapped feature is a huge benefit for DIY mechanics, ensuring the plug is ready to install correctly and immediately minimize potential fouling issues.

Helpful Comparison Short Insights

When choosing the best spark plugs for burning oil, you need to weigh cost against longevity and resistance to fouling.

For engines that are severely fouled and require frequent replacement, sticking to reliable, low-cost plugs like the Stens Torch or PK2 TORCH AC6RA is often the most economical short-term solution until the engine can be repaired. You simply can’t afford to throw expensive Iridium plugs at an engine that fouls every 50 hours.

If your engine has minor oil consumption (light blue smoke only at startup or during deceleration), investing in Iridium plugs like the NGK Iridium IX or SYKRSS 3481 offers a real performance advantage. Their concentrated, hot spark is much better at burning away minor oil residue, significantly extending the time before a misfire occurs.

The E3 DiamondFIRE plugs (E3.36 and E3.16) provide a fantastic middle ground. Their unique electrode design promotes a cleaner burn and minimizes carbon buildup, offering a practical solution for engines where oil and carbon residue are primary issues, often performing better than standard plugs without the high cost of Iridium.

Always ensure the replacement plug has the correct heat range. Using a plug that is too cold will only accelerate fouling, regardless of the core material.

Final Verdict

If you’re dealing with an engine that burns oil, your choice of spark plug should reflect the severity of the problem and your budget.

Our Top Recommendation for Resistance to Fouling (Longevity Focus): If you prioritize having the longest possible interval between plug changes and can handle the higher price tag, the NGK Iridium IX DCPR7EIX (or any high-quality Iridium plug compatible with your vehicle) is the winner. The intense spark best resists oil and carbon contamination.

Best Value and Self-Cleaning Capabilities: For small engine and powersport applications suffering from deposits, the E3 Spark Plugs E3.16 or E3.36 are excellent choices. Their DiamondFIRE technology truly helps minimize deposits, providing a noticeable improvement in starting and idling stability.

The Practical Budget Solution: If you know your engine needs major repair soon and you need a reliable, cost-effective plug to simply keep running, stick with the Honda 2 Pack Genuine 98079-56846 (if compatible) or the PK2 TORCH AC6RA. These offer great dependability at a price point that makes frequent replacement bearable.

Comprehensive FAQs About Best spark plugs for engines burning oil

Q1: Why do spark plugs fail faster when an engine is burning oil?

When an engine burns oil, usually due to worn piston rings or valve seals, oil residue enters the combustion chamber. This oil burns, leaving behind a sticky, conductive layer of ash and carbon on the spark plug tip. This contamination is known as oil fouling. This deposit acts as a short circuit, preventing the spark from jumping the electrode gap and causing a misfire or hard start.

Q2: Can high-performance plugs, like Iridium, stop oil fouling?

No, no spark plug can stop an engine from burning oil. However, Iridium and Platinum plugs generally resist fouling longer than standard copper plugs. This is because they run hotter (due to their construction) and have a strong, concentrated spark that is better at burning away minor contamination before it can build up enough to cause a misfire.

Q3: What is the benefit of using an extended nose or projected-tip plug in an engine that burns oil?

A projected-tip or extended-nose plug places the firing end further into the combustion chamber. This allows it to run hotter, which helps to burn off oil and carbon deposits before they can solidify on the insulator. This design is often referred to as being more anti-fouling than a non-projected plug, though you must ensure it’s the correct heat range for your specific engine to prevent pre-ignition.

Q4: Should I use a “hotter” plug if my engine is experiencing oil fouling?

Adjusting the plug’s heat range is a common, though controversial, strategy for engines burning oil. A hotter plug has less ability to dissipate heat, allowing the tip to stay warmer and potentially burn off oil deposits. However, using a plug that is too hot can lead to severe engine damage from pre-ignition. Always try modern anti-fouling designs (like Iridium or E3) first, and only consider a hotter plug if specified by an engine expert, and only if the engine is not turbocharged or high-compression.

Q5: How often should I check or replace my spark plugs if I know my engine is burning oil?

If you are experiencing minor oil consumption, you may need to replace standard copper plugs at intervals significantly shorter than the manufacturer’s recommendation—perhaps every 5,000 to 10,000 miles in a car, or every season in a small engine. If you switch to iridium spark plugs, you might extend this interval by 50% or more due to their superior resistance to carbon buildup.

Q6: Besides spark plugs, what is the best strategy to manage an engine that is burning oil?

While the best long-term solution involves replacing worn internal components (piston rings, valve guide seals), common management strategies include regularly checking your oil level (weekly), using thicker oil (if permissible by the manufacturer), and using engine oil additives designed to swell worn seals. For small engines, ensuring the crankcase breather system isn’t clogged can also reduce the blow-by pressure causing the oil consumption.