Originally Posted By: m6pwr
Originally Posted By: CATERHAM
Originally Posted By: SteveSRT8
Originally Posted By: m6pwr
Just a thought: Is it possible that BMW deliberately runs the n54/n55 twin turbo direct injected engines so hot (250 F) as a way to keep fuel dilution in check?
Coolant temps or oil temps?
Oil temps that hot are not harmful at all to most modern oils. And they certainly don't need to be that hot for fuel dilution.
We're talking about oil temp's, and the justification for heavier oil grades.
Also I think m6pwr was half joking when he alluded that high oil temp's would assist is nipping fuel dilution in the bud, which it certainly would.
Sorry, I wasn't clear. I meant oil temps which typically run close to 250 F, particularly in the n54 (2007-2011). And as I understand it, fuel dilution goes hand in hand with most direct injection motors.
Thanks, I missed those critical details.
But fuel dilution appears in many non DI cars as well. My car is factory specified for a 3k mile OCI with synthetic oil!
Strictly due to aggressive tune that causes fuel dilution, even with very high oil temps.