the big eights have a tendency to run (dirty)and also create more heat on the bearing surface than the small one.after trying several oils including valvoline, mobile,kendall,and castrol
which are all good oils i found that chevron 15-40 delo 400 does the best.it has a high flash point and excellent viscoscity index.85% of the semi trucks use it and has proven record.make sure your rod tolerance is .0014 to .0018.
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