Losing a lot of oil

[weetan]

Hey guys. I’m curious if you all have an answer to this. I have a 2012 m5 with 96k miles on it. It’s been losing a ton of oil. ZERO leaks or smoke at all. I’d say it’s losing a quart every 500 miles which seems really high. I replaced the pcv valves with no luck. Could this be pcv system related or possibly valve stem seals? Or bottom end is in need of a refresh? Any help would be appreciated. TIA.

[M5Rick]

What oil are you using and what grade.

[weetan]

Originally Posted by M5Rick

What oil are you using and what grade.

Liquimoly 5w-40

[M5Rick]

5/40 is what a lot of US owners use. If valve stem seals were worn there would be smoke from exhaust and it's a Canadian car. All you can do if you're sure there are no leaks is top up and try a different recommended grade on oil change time like Mobil 0/40 euro formula and you have put the car in sport + to run on the first digit on the oil temp gauge is all I can suggest for now.

[M5 Hayden]

I’m in the same situation here. I bought a 2012 BMW M5 last week (2011 manufactured) and drove 1000km back home, now the car is at 116000km. I’m now down to 1/2 scale after I topped up to maximum about 200km ago (no typo) meaning I have to top up 1 litre every 400km. I don’t notice any leaks nor any abnormal smokes which could be caused by bad piston rings or valve stem seals, recently the PCV has been repaired. The car drives fine and I do always drive it hard every time when it’s warm. I guess it’s just due to the design of engine.

Also I believe the rod bearings does not have a relationship with oil consumption and they should be replaced when you see metal shavings in oil/filter. Oil change is also a good time to see if you are leaking any oil under, will soon be due for my car.

I’m not a mechanic here but here are just my thoughts so please correct me if I’m wrong.

[Nickolashead]

My local dealer told me that’s normal. Idk?

[M5 Hayden]

Originally Posted by Nickolashead

My local dealer told me that’s normal. Idk?

It’s the horrible design of early N63 engines they overheat too much as the turbos are on the top they drink oil and eats the valve stem seals until the later G series N63 and S63 engines unless there’s extreme smoke coming from the exhaust I’d leave it alone and make sure oil level is ok.