I run 15/40 Diesel Oil which I purchased in gallon containers before the oil Zinc levels were lowered.
Again based on the BP Engineers suggestion. I have about 200 quarts worth of the oil with a ZDDP (zinc) amount of 1400 ppm.
I also paid 1/4th of the price of the Valvoline VR-1 Racing Oil (per quart) available today.
When they took the ZDDP amount below 1000 ppm per quart, the BP Engineer said you could have camshaft and lifter failures on flat tappet camshaft engines. He knew I was using that design of camshaft.
So I think the OP basically had a issue that was oil related and caused the initial concerns and later failures.
Tom V.
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"Engineers do stuff for reasons" Tom Vaught
Despite small distractions, there are those who will go Forward, Learning, Sharing Knowledge, Doing what they can to help others move forward.
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