Running BMW/Castrol 5W30 in mine...no issues. No tune but ran all this weekend here in Dallas at the track. Temp outside was 80-90 degrees out and not heat issues at all. My temps were running no higher than 250.
Another 1M board member was running the Dinan tune with no issues as well. We compared notes and he wasn't running any higher temps than myself.
I think you pretty safe with the OEM setup.
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Current - 2015 Cayman GTS White Borla Exhaust
Prev - AW 1M #43 USA
Meisterschaft, N55 mids, AFE CAI, ER Charge, Wagner IC
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