11-11-2023, 01:48 PM | #1 |
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Oil Analysis shows &% fuel in oil???
So I have a 2013 Comp Pack, running a BPM tune, dps and intakes. Our fuel is sub-standard, so I always add either 10% ethanol or a good octane booster when re-fueling.
I change the oil annually and cover about 4,000 kms in a year. I use Ravenol VST 5w40. The car's done 80,000 kms. Below is a lab report of an oil analysis done last week. The oil was drained after 4,000 kms. I am surprised by the results. The report indicates that the sample oil had just about exhausted its lifespan and that it had 7% of fuel. It is suggested that I check the fuel system. My questions: 1)Am I correct that if there is an issue with the fuel system causing the ingress of excess fuel into the oil, the only possibilities are faulty injectors and/or fuel pumps? 2) The car doesn't miss a beat. Idles smoothly from cold start and goes like the clappers. My LTFTs and STFTs indicate no issues at all. My HPFPs churn out similar pressures - between 6500 and 7500 psi at idle and around 2,900 psi under WOT. Would my data logs not indicate some irregularity or another or would the car not run less than perfectly if there were an underlying issue with either the injectors or the HPFPs? 3) My car is fitted with EU5 injectors. If I do need to change all of them, can I use EU6? 4) Are the OE injectors manufactured by Bosch? If so, does anyone have the Bosch part number? Cheers [ATTACH][/ATTACH] |
11-12-2023, 11:44 PM | #3 |
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Not at all. It's a weekend car and the oil will almost invariably reach operating temperature on each trip. I've just spoken to a local tuner who reckons the most likely cause (given that my car runs perfectly and shows no signs of a misfire) is a leaking HPFP. That would make sense and is first on my list to have checked.
Last edited by ajm55; 11-13-2023 at 06:13 AM.. |
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11-19-2023, 08:25 AM | #4 |
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I don't claim the know the source of the issue, but if your car has a tune in it, I would think about that as well. To the best of my knowledge, tuning entails revising injector firing durations (at least it does on my E30 M3 tune; I have full access to the fuel map). Now what are the implications of that in terms of having fuel in your oil? I don't fully know as it probably depends on how that duration overlaps with the cylinder position, how fuel gets (or does not get) burned throughout that process etc. If that may be a/the cause, replacing the injectors will not change anything. That doesn't mean your injectors are good (not "sticky") though, which is also a possibility.
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11-20-2023, 12:19 AM | #5 | |
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11-25-2023, 09:19 AM | #6 | |
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11-27-2023, 01:32 AM | #7 | |
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I add octane booster / ethanol because our fuel (which has no ethanol content) is sub-standard. It is probably the equivalent of 90 octane in the USA and I see loads of timing pull when not adding octane in some form or another. I have now replaced the injectors and will have another oil analysis done in about 4,000 kms to assess. |
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12-23-2023, 06:22 PM | #8 |
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I misread your initial post. I thought you were adding octane booster because the fuel has ethanol. Good luck with diagnosing the issue and keep us posted.
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01-06-2024, 08:30 PM | #9 |
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Hello,
Any updates? I'm curious because I've been having a strong smell of fuel on my oil changes and I do about 5000-6000 kms/1 year between oil changes. My M5 is at 165xxx km now and I changed all of the injectors to EU5 Bosch ones. Approx. 3 years ago when it had 110000 kms on the clock. I also use Ravenol VST 5w40 oil. Measured the oil physically, because I do not trust the oil level sensor to be correct, and I lose about 1L of oil/5000 km. Anyway, please let me know if replacing your injector has fixed the fuel dilution. |
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01-08-2024, 03:42 AM | #10 | |
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02-05-2024, 06:29 PM | #11 |
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Make sure you resolve the fuel in oil issue. I had an e90 335i with a leaky injector. it leaked fuel after turn-off into cylinder, past the rings, and into the oil. Diluted the viscosity enough that I ended up with bearing damage. Ended up getting another 335i rather than repair the engine; it was too costly.
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05-21-2024, 04:17 AM | #12 | |
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Please post your next oil analysis results, as I'd love to know if the HPFP change solved your issue! |
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05-21-2024, 09:25 AM | #13 | |
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