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jovonni31 jovonni31 is offline
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Default Oil on pistons? - 05-11-2019, 05:15 PM

Changing oil and plugs since flashing mhd , decided to see how the cylinders look. Looks like oil on top not sure if thatís good or bad. , plugs donít have any oil and catch can is bone dry , my pics to large. To post all
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jovonni31 jovonni31 is offline
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Default 05-11-2019, 05:17 PM

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Nanometer Nanometer is offline
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Default 05-13-2019, 10:34 AM

might be a good idea to run an oil diagnostics, and a compression test. No clue if the oil is normal, I would guess no, but it could be a few different things. Could be leaky valve seals, piston ring, etc.


335i E90 2009 ///M Sport Auto
Mods: | Wagner Intercooler | MeowPipe | Meth-Trunk | JB4 | Pump_Back_End_Flash | Fuel-it! Stage 2
Drivetrain--------ForgeStar F14 Wheels 18" (245 & 275 PS4) | XHP L3 Transmission Flash | Wavetrac LSD
Suspension-------KW V3 Coil Overs| M3 RSF Bushings and Dif Bushings | H&R Sways


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jovonni31 jovonni31 is offline
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Default 05-13-2019, 01:13 PM

I am hoping some more engine experts can chime in, all the cylinders had this small amount of oil, so is it possible all the piston rings are bad sounds super costly , what other options do I have, I don't see any smoke. and my oil level hasn't been down at all. could it be just a fluke and maybe drive moderately for a bit and recheck, I did change to 0w30 from 0w-20 but this was before car was even started with new oil .


2016 340i trackpack , JB4,MHD BEF e85 tune, BMS intake, BMS CC
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Nanometer Nanometer is offline
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Default 05-13-2019, 03:32 PM

Well, considering that my intercooler was coated with oil when I took it apart after being installed for only 100 miles, it's probably not too surprising. I agree, if all cylinders had it, it's likely not bottom end/ring related. A compression test is quick and easy to do and tells you a lot of good information.


335i E90 2009 ///M Sport Auto
Mods: | Wagner Intercooler | MeowPipe | Meth-Trunk | JB4 | Pump_Back_End_Flash | Fuel-it! Stage 2
Drivetrain--------ForgeStar F14 Wheels 18" (245 & 275 PS4) | XHP L3 Transmission Flash | Wavetrac LSD
Suspension-------KW V3 Coil Overs| M3 RSF Bushings and Dif Bushings | H&R Sways


X5 50i 2013 ///M Sport
BMS Stage 1

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dRDiesel dRDiesel is offline
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Default 05-13-2019, 10:02 PM

Your oil control rings are at the very bottom on the piston doubt oil is making its way up to the firing ring or else you would be burning a ton of oil and smoking.


| 2018 BMW 340i | M-Sport | Track Handling Package |
| Pure Stage 1 | MPE + ER down-pipe | BMS Intake | JB4 + MHD E85 BEF | BMS Meth Kit |
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dRDiesel dRDiesel is offline
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Default Today, 12:26 PM

This might actually be caused by a bad valve cover since the PCV system is built inside or something within that range. B58 valve covers have been recently getting replaced supposedly.


| 2018 BMW 340i | M-Sport | Track Handling Package |
| Pure Stage 1 | MPE + ER down-pipe | BMS Intake | JB4 + MHD E85 BEF | BMS Meth Kit |
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