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9 hours ago, lcxu105 said:

Why so heavy

With that much hp you're not likely to treat it nicely.  Plenty of revs and load, use the grunt.  So the mains and big ends are going to want film strength to carry the load of those cylinder pressures.

And you have solid lifters, no hydraulics to complain about oil thickness on cold start.

What did your engine builder recommend?

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Just a case of using what works really.  With the ready availability of accurate/reliable oil pressure sensors to input into ECU, and easy/cheap oil sample analysis I'd suggest not too hard to monitor and change if required.

People in areas where winter temps are in single figures overnight might want the viscosity numbers lower esp for daily driving and cold startups.  My hydraulic non-Neo head has had no issues with a 15w50, or even the HPR30 with initial startups.  Queensland temps though.

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