I do not bother with Amsoil only because there is no where around here that sells it and it is not much better than M1 or RP.
It is pointless to maintain a 3k OCI, there is no advantage to changing at 3k instead of 5k. It just wastes your money and hurts the environment. Get your oil analyzed after trying both and I bet you will see that the oil is holding up just as good at 5k as it was at 3k.
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