It depends on oil temperature. Tony is happy with 50 but is he happy with 43 when it's 90 degrees out and oil temps rise? My point, monitor your SPECIFIC application and call your engine builder. They want to hear from you and THEY make the call. To many guys just wing it and it costs them. I know Weld has more money than Donald Trump but playing ring around the rosey with engines isn't my idea of a spring picnic.
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Todd
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