is oil killing our Cars

[Chevy454]

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He couldn't recall anyone ruining a flat tappet cam after break-in.

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We lost a 143 repro cam in our Y-Nova...thing had a funny sound and wouldn't smooth out, so the old man decided it needed a 1/4 mile tune up. He smoothed it right out, 'cause the engine locked up and he coasted back into town with a dead bullet! It was uggggggly...had to drive out a few lifters, jimmied up the oil pump shaft, chunks of cam/lifter everywhere inside. That cam was correctly broken in on the dyno, and ran flawlessly for 2 years, and pushed our Y-Camaro to mid-12s right before being put into the Nova...whether the manufacturers wanna admit it or not, the oil and cam blanks share the blame.

[JohnZ]

The "diesel oils" have also been affected recently. The API-spec "CI-4" diesel oil (which has a very high level of ZDDP) has been around for a long time (Shell Rotella, Mobil Delvac, etc.). However, the new EPA Tier II Bin 5 diesel emission requirements that go into effect next year require the use of catalytic converters and particulate traps, which are "poisoned" by the high level of ZDDP in the CI-4 diesel oil, so there's a NEW diesel oil, API spec "CJ-4", with a much-reduced level of ZDDP, intended for use with the new low-sulfur diesel fuels in the 2008 Tier II-regulated diesel engines.

CI-4 diesel oil offers better protection for sliding elements than the new ZDDP-reduced CJ-4 diesel oil; diesel oil used to be diesel oil, but now there are two DIFFERENT diesel oils.

[Chevy454]

Great info, John...someone told me the diesel oils were gonna take a hit, but I could never pin it down.

[GRB]

The dirty bastids. They got the diesels too.