10-08-2019, 06:47 AM | #1 |
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Milky oil cap
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My mate has a 2014 F10 M5 which he has just come to realise when doing a service that he has some milking which was present on his oil cap. pics below. (ps. the lat time he checked his oil cap was maybe 6-7 months ago) Now i know typical signs would be blown headgasket and loss of water coolant. He did get loss of water but we believe that was due to leak on the top pipes as one of the rubber hoses was loose and it was evident coolant marks were all over the turbo heatshields. Coolant has since been topped up (few days ago) and is awaiting to see if he gets loss of coolant again. But in the meantime he is panicking he has a blown headgasket. Would the M5's typically produce any milkiness in the oil? I have read plenty about water condensation causing this when the engine has not been warmed up to temp? His typical driving is only a 5 mile commute to work and 5 mile back home so his engine does not really warm up properly. Any guys who could shed some light on this would be much appreciated. Thanks |
10-08-2019, 07:08 AM | #2 | |
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10-08-2019, 07:13 AM | #3 |
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It's just condensation build up. Wipe it off when you see it but don't worry about it.
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10-08-2019, 07:29 AM | #4 |
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All cars get that, need to get the engine hot to burn off the condensation. The leaking turbo lines would drain his intercooler system not his engine coolant. Which did he top off?
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Last edited by SapphireM5; 10-09-2019 at 02:37 PM.. |
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10-08-2019, 07:52 AM | #5 | |
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He topped up the cooler on the passenger side (RHD car) circled in red in the pic below |
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10-08-2019, 08:24 AM | #6 |
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10-08-2019, 08:34 AM | #7 |
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10-08-2019, 08:42 AM | #8 | |
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I'm sure his gasket hasn't blown and these big 4.4 engines do need an ENGINE filler small top up from time to time, fill 50/50 BMW anti freeze mixed with distilled water only. |
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10-08-2019, 11:55 AM | #9 |
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Everything looks fine to me. As has been mentioned the residue under the cap is purely condensation mixed into oil. The coolant bottle circled red is difficult to check the level on. Take the cap off and shine a torch down there, you should see the water somewhere in the neck.
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10-09-2019, 11:34 AM | #10 |
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Just to clarify the cooling circuits I went back to the training manual. The blue circled cap in the OP's photo is the lower temperature coolant circuit which runs the intercoolers and DME's. The red circled cap controls everything else... engine coolant AND turbo coolant. The confusion comes because the turbo coolant circuit is only opened during specific operating parameters and the obvious one being after engine shutdown. These circuits use the same expansion tank and pressurized cap (red circle).
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10-09-2019, 12:18 PM | #11 | |
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Thanks for pointing this out, I never thought to mention it myself. |
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10-09-2019, 01:34 PM | #12 | |
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10-10-2019, 06:44 AM | #14 | |
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All comments passed onto my friend and he is most certainly relieved. Not usual for a M to be blowing a headgasket so soon with only 30k on the clock unless its been abused or run on low coolant. |
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