|
Your engine lost nothing with the 5W40, it is still a 40W at operating temperature. Do back to back dynos and then we can talk. Until then, you are just buying into a myth, the oil is not getting pushed out of the lifters at high RPM. The amount of HP gain/loss from oil is negligible at best. Besides, the S65 is rev happy even with the 10W60.
__________________
2011 E90 M3 ZCP - Individual Moonstone/Individual Amarone Extended/Individual Piano Black With Inlay:LINK!!!
1994 Euro E36 M3 Sedan - Daytona Violet/Mulberry:LINK!!!
|