When to switch to Synthetic Oil
#3
hey duramax, deuce rooster is right. You just need enough hours on the motor 2 let the rings set properly. Try it in your truck you will be amazed at the difference in mileage. Amsoil, or royal purple . I have had luck with both.
#6
Unless it is a specific 4 stroke oil desigened for common lube of tranny/clutch and motor, do not use it. It will cause the clutch to slip if not specifically designed for this application.
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