I'm curious as to who's going to deviate from the manufacture's recommended 5w30/10W-30 and use 10W-40. I realise it takes a good amount of courage to do this.

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I have trouble understanding the purpose for this thread.![]()
1. With gasoline headed back to the plus $3 level, the smart play is to run the thinnest API starburst viscosity for your application.
2. Why would it take courage to pour 10W-40 into the crankcase?
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I have trouble understanding the purpose for this thread.![]()
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I use 15w40 (HDEO) in my Acura Legend year-round.
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There is a great UOA on a BMW V12 on GTX 10w-40.
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Courage to use 10W40?? I thought I'd seen everyhthing dumb there is on BITOG but this takes the cake.