[mweisdorfer]

Originally Posted by jonathansbmw

Standard BMW TwinPower Turbo LL01 5W-30 "Pennzoil" but, you do bring up an interesting point.

Not too long ago, BMW switched from Castrol as their oil supplier to Pennzoil. This is the only change in type/brand I've had in the 8 years I've owned the car.

Could this be it? Can viscosity be a little different between brands causing the extra heat?

I personally use 5w-40 for both by n54 & N52 motors. The brand I use is Amsoil European formula.

I always do an oil flush before I put in new oil, and I always change the filter put half way through the interval.

It's pretty rare, unless I am in stop and go traffic that my oil temp on the n54 goes over 230, and I don't have an oil cooler on my 335i either.

[Volasko]

Read page 67 -70 from this technical report on our engines:

https://drive.google.com/file/d/0B8p...ew?usp=sharing

It explains that our cars have different temperature setpoints based on what map mode our cars are in. It explains why it can fluctuate so much.