Quote:
Originally Posted by xsnapshot
Nothing about your motor has changed other than the power output. Oil galleys/clearances/bearings/etc was all designed for 0-20. Use a quality synthetic 0-20.
If your oil temps are staying within range there is absolutely no reason to switch to a heavier oil.
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Increasing the power output alone is a good reason to switch to a heavier oil, IMO. Oil temps alone do not tell you anything about your film strength and whether or not the HTHS and kinematic viscosity are sufficient for bearing protection in a particular application.
I hear a lot of talk about this engine being "designed for 0W-20" although Subaru Japan allows thick Euro 0W-30 and 5W-40 in a stock BRZ.
http://www.subaru.jp/accessory/engin...miumoil01.html
http://www.subaru.jp/accessory/engin...miumoil02.html