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      10-25-2012, 12:02 PM   #2
Brigadier General
FCobra94's Avatar

Drives: '07 E90 335i
Join Date: Dec 2011
Location: MD

iTrader: (1)

I use RLI Bio-SynXtra Heavy Duty 5W40 in my 335i. The oil definitely runs cooler in my car compared to the dealer supplied oil which the car was running before.

Typical temps for the old oil were 245-250*F. Ever since I've changed the oil, it now tends to run at about 225-230*F. Not only that, but the oil cools down MUCH faster than before as well. After blasting through the gears and letting the car sit for a minute or two, the oil temp comes right back down to that ~230*F range almost immediately. For that reason, I have a feeling it would make for an excellent choice for HPDE events, etc. compared to other synthetics.