6.1% Fuel in Oil Need Help!

PatrickRodriguz · 01-09-2026, 11:18 AM

Hi all, I sent an oil sample for testing and after going through all the results (screenshot attached), the only thing that stuck out was getting a 6.1% fuel in oil alert from the report. The car has 126,000km on it, is a second owner, had its first oil change, and I’m not sure how long it sat for. It’s a Canadian car, cold outside temps before sample, 48km trip before the oil sample was taken. Is this common in the LT1? Any advice for people who have experienced similar issues, as I couldn’t find it being reported in the forums?

ctrlz · 01-09-2026, 11:27 AM

That sounds very high to me.
I bet you could smell it at 6%.
Any mods to the car?
Might want to compression test the cylinders.

Dynamical · 01-09-2026, 04:00 PM

Since you have no record of oil changes before buying the car, there's a question on how long that oil was in there and what the driving habits were with previous owner.
I'm willing to bet the oil was neglected and seeing how it's a Canada car, the colder weather has a hand in this.
I would send in another sample before it's time for another oil change. See if the results are better. Update us!

m6-lt1 · 01-09-2026, 05:50 PM

Mine was 0.8% after 1500 miles and 5 track hours.

I agree with others. I think the oil was in there awhile and the cold has a little to do with it.

PatrickRodriguz · Yesterday, 02:03 AM

No mods to the car, good possibility the oil sat in the car for months, if not a year however, the first five years of service history are excellent. The last two years, it drops off.

cdb95z28 · Yesterday, 06:31 AM

Cold temps can play a part, as the engine, especially our DI engines will fire rich until they warm up. Lots of idle time and cold starts can raise fuel content, but I'm not sure how high can the percentage could go in these scenarios.

But dirty injectors can be a major problem. Start with some Chevron Techron (buy the big 32oz from NAPA), Driven Fuel Injection Cleaner, or Redline SI1. These have the highest PEA content.

Second, use only Top Tier fuel. Top Tier has a higher PEA content than the EPA minimum of regular non Top Tier fuel.

Dirty injectors will not atomize the fuel properly. On our DI engines, which by their nature are already hard on oil (fuel dilution), will dilute the oil at a higher rate when the injectors are not properly working.

Regular Top Tier fuel use is more important on DI engines. Especially any of our cars that see the track. Fuel dilution will degrade the viscosity.

https://youtu.be/CAGT5inQScE?si=tjyBvDXohzTPf8pb

https://youtu.be/DAmEGI7xvBw?si=tWplCEgHA2cvCpbQ

https://youtu.be/MAAJCEatYsY?si=3aeUkpGwk6WV-EMZ

bishopts · Yesterday, 07:14 AM

Ive replaced a few high pressure pumps on the trucks for fuel in the oil. I usually picked it up by noticing negative fuel trims.
I would replace the pump and the oil then monitor fuel trims to verify the correction on those.
Look at your long term fuem trim, if it's below -5 then you might have the same problem. I wouldn't say jump into changing the pump, reset your fuel trim after your oil change and monitor it over the course of the interval.

Another possible cause would be a lot of cold starts and cold shut downs can cause rich fuel mixture to end up in the oil, i wouldn't think to the extent of 6% but it could be a combination of av few things adding up to that much.

01-09-2026, 11:18 AM	#1
PatrickRodriguz Drives: 2018 SS Join Date: Dec 2017 Location: Mississauga Posts: 17	6.1% Fuel in Oil Need Help! Hi all, I sent an oil sample for testing and after going through all the results (screenshot attached), the only thing that stuck out was getting a 6.1% fuel in oil alert from the report. The car has 126,000km on it, is a second owner, had its first oil change, and I’m not sure how long it sat for. It’s a Canadian car, cold outside temps before sample, 48km trip before the oil sample was taken. Is this common in the LT1? Any advice for people who have experienced similar issues, as I couldn’t find it being reported in the forums? Attached Images

01-09-2026, 04:00 PM	#3
Dynamical Drives: 2022 Camaro LT1 A10 Join Date: Nov 2015 Location: new england Posts: 570	Since you have no record of oil changes before buying the car, there's a question on how long that oil was in there and what the driving habits were with previous owner. I'm willing to bet the oil was neglected and seeing how it's a Canada car, the colder weather has a hand in this. I would send in another sample before it's time for another oil change. See if the results are better. Update us! __________________ 2022 Camaro LT1 A10 - Drag Pack/Corsa double X pipe/AWE track axleback -11.849@118.67MPH/1.798 60' 2001 Camaro SS A4 - HCI/Stall/Bolt-on/Gear/Tune/DR/Diet - 429HP/392TQ - 10.99@123.58MPH/1.584 60' 1998 Camaro Z28 A4 - Bolt-on 1999 Camaro Z28 A4 - Stock

01-09-2026, 05:50 PM	#4
m6-lt1 Drives: 2023 Chevrolet Camaro 2SS 1LE Join Date: Jan 2020 Location: Pennsylvania Posts: 1,599	Mine was 0.8% after 1500 miles and 5 track hours. I agree with others. I think the oil was in there awhile and the cold has a little to do with it. __________________ Current: 2023 2SS 1LE Prior: 2016 Camaro 1SS 2007 Mustang GT 2008 Civic Si

Yesterday, 06:31 AM	#6
cdb95z28 Drives: 2022 1SS 1LE A10 BCD WCT+PDR Join Date: Mar 2008 Location: Johnstown, PA Posts: 3,747	Cold temps can play a part, as the engine, especially our DI engines will fire rich until they warm up. Lots of idle time and cold starts can raise fuel content, but I'm not sure how high can the percentage could go in these scenarios. But dirty injectors can be a major problem. Start with some Chevron Techron (buy the big 32oz from NAPA), Driven Fuel Injection Cleaner, or Redline SI1. These have the highest PEA content. Second, use only Top Tier fuel. Top Tier has a higher PEA content than the EPA minimum of regular non Top Tier fuel. Dirty injectors will not atomize the fuel properly. On our DI engines, which by their nature are already hard on oil (fuel dilution), will dilute the oil at a higher rate when the injectors are not properly working. Regular Top Tier fuel use is more important on DI engines. Especially any of our cars that see the track. Fuel dilution will degrade the viscosity. https://youtu.be/CAGT5inQScE?si=tjyBvDXohzTPf8pb https://youtu.be/DAmEGI7xvBw?si=tWplCEgHA2cvCpbQ https://youtu.be/MAAJCEatYsY?si=3aeUkpGwk6WV-EMZ __________________ 2022 1SS 1LE A10 BCD WCT+PDR2014 1SS 1LE NPP RECARO SIM-SOLD1995 Z28 M6 GSC PGM-SOLD1975 NOVA COUPE 300HP 350 TH350 FLASH RED-SOLD "KEEP THE FAITH"-Fbodfather

01-09-2026, 11:27 AM	#2
ctrlz Drives: 2017 2SS, 50th pkg, M6, MRC, NPP Join Date: Jan 2016 Location: Ocean City, NJ Posts: 3,555	That sounds very high to me. I bet you could smell it at 6%. Any mods to the car? Might want to compression test the cylinders.

Yesterday, 02:03 AM	#5
PatrickRodriguz Drives: 2018 SS Join Date: Dec 2017 Location: Mississauga Posts: 17	No mods to the car, good possibility the oil sat in the car for months, if not a year however, the first five years of service history are excellent. The last two years, it drops off.

Yesterday, 07:14 AM	#7
bishopts Drives: 2017 2ss 6mt Join Date: Mar 2024 Location: dallas Posts: 946	Ive replaced a few high pressure pumps on the trucks for fuel in the oil. I usually picked it up by noticing negative fuel trims. I would replace the pump and the oil then monitor fuel trims to verify the correction on those. Look at your long term fuem trim, if it's below -5 then you might have the same problem. I wouldn't say jump into changing the pump, reset your fuel trim after your oil change and monitor it over the course of the interval. Another possible cause would be a lot of cold starts and cold shut downs can cause rich fuel mixture to end up in the oil, i wouldn't think to the extent of 6% but it could be a combination of av few things adding up to that much.

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