BRZ

[ScottyB]

Though honestly I don't think it should be a problem.  The BRZ/FRS community has been invaded by parts hockers who just convince kids to dump tons of money into the cars and it appears that was where this "must have oil cooler" stuff came from on the forums.
270 is about the highest Ive heard of a stock car doing which is nothing for Mobil 1.  I also went to 5w30 which is a touch heavier but still within factory spec.    
The oil itself can handle 500 degrees with no degradation (according to Mobil engineers) so its the oil pressure drop that you have to worry about the most.  
Since oil coolers also cause an oil pressure drop,  often times you are ending up at the same oil pressure as you would have anyway without one.

oh there's no doubt the FRiSBee community is overrun with snake oilers. seperating the wheat from the chaff on those forums practically takes a stats degree. good point about pressure loss, that's something i forgot about.

i think 500 degrees is phenomenally optimistic given that oil's propensity to shear down out of grade into 20 weight territory, but yes the occassional time spent above 250deg doesn't really hurt modern synthetics. i've seen talk that SRT engineers at Chrysler don't bat an eye at oil temps until they crest 300. again, more than i'd be cool with but wtf do i know anyway.

as the young bucks like to say these days, just send it. oh yeah, and enjoy your oil changes on those flat engines. i super miss how insanely easy that used to be when i had my RS.