Oil leak 318i M40

[chu346]

My engine is loosing oil but i'm not sure where from I can't see any real oil leaks on the engine, but i'm going from max-min on the dipstick in 3 weeks.

What are the usual places where these engines loose oil?

318i M40

[dMh]

well you could check the upper and lower part of your oil pan, you could also check the valve cover (however quite unlikely) or the head gasket (very unlikely as if the head gasket is damaged you'll get lost compression coupled with smoke from your exhaust). my best bet is the upper and lower oil pan.

[chu346]

Oil pan and valve cover look good.

[dMh]

really? no oil leaking from the oil pan? no black stuff??

that's odd, does your exhaust gives out smoke? if it does try a compression check

oh, when you mean oil pan, was it the lower part or the upper part?

[chu346]

Just noticed I got a puff of smoke on start up this morning from cold, but not again for the rest of the day when running or start up.

Oil pan all over is fine

[chu346]

bump

[dMh]

in that case try checking the oil filter and replace o-ring afterwards.

also, is your gearbox sides seeping with oil? oil could leak from either the front or rear crank seals (if from rear crank, oil could seep on the gearbox), and also is your fan cover oily?

this is really odd...

oh yea! one vital question: do you see oil under the engine when you leave the car for a day or in the morning? if its not, i think its going somewhere else