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Old 10-10-2013, 03:10 PM
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On a fresh break-in flat tappet,never,ever a detergent oil.Gibbs has a break-in oil and one after that for flat tappet cams.Oh I see where LSx rollers want the same kind of treatment.

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Old 10-10-2013, 10:40 PM
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I've been running in flat tappet cams forever with plain old off the shelf 10W-30. Now that the ZDDP is gone I use VR1 10W-30. No additives, no crap, no non-detergent junk. Just good oil with plenty of zinc in it. I have never had a wiped lobe ever. If you assemble them properly and use good assembly lube you only need good oil with zinc.
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Old 10-11-2013, 04:05 AM
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I have switched to using Mobil 1 15w50 because it has the high zinc and phosphorus levels that are recommended for a flat tappet cam, and its readily available from quite a few stores. I can usually find it on sale at Advance Auto or Autozone, often sold as a 5 quart bottle and filter combination. My truck has GM crate engine, so I don't know anything about machining tolerances. However, I have not had problems running the same weight of oil year round.

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