If I had more confidence that I could make a flat tappet cam
live, I'd just go back to them.
The '528 lived for years while I used VR-1 oil but within a year or so of using another brand, it was Wiped out. Dwayne thought the oil was to blame for a couple of reasons. 1) It ran fine until the change. 2) The oil I had was HIGH detergent but claimed to have ZDDP.
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His reasoning was that the ZDDP is great but the high detergent surely wiped away the ZDDP too fast for it to protect anything.
I've been running proper oil since the rebuild...
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I changed to thicker oil last week but used this:
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I'm only guessing but I'll bet the overall failure rate of flat tappet cams is pretty low when proper oil and springs are used.