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That is correct. We use mobile 1 BUT only 0w-40 which has a good zinc content.
In the last few years we have seen a good amount of cam/lifter failures. All different brand cams so I rule the cam out. Most common answer was using whatever oil was on sale.
I think the cams falling apart is what causes the oil pump pressure valves to stick. I've had a mellings stick before.
So, best I could say is use the correct oil and filter, change regularly.
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