The engine RPM may be varied periodically from 2000 to 2500 to direct oil splash to different areas of the camshaft. Slower engine speeds will not supply the camshaft with an adequate amount of oil for the break-in period. As soon as the engine fires, bring the RPM up to 2000 to 2500 during the first 30 minutes of operation. This allows the lifters to establish rotation and develop a good wear pattern. Other non-synthetic, heavy-duty motor oil along with COMP CamsĀ® Part #159 Break-In Oil Additive may be used. COMP CamsĀ® recommends using Part #1590 (10W30) or #1591 (15W50) Engine Break-In Oil. Also, we do not recommend the use of synthetic motor oils during the break-in process. Important: On hydraulic flat tappet cams that require dual valve springs, the inner spring must be removed during break-in. If you'd like something other than opinion, here is what Comp Cams has to say about it for their flat tappet cams (most every other cam manufacturer is going to say the same): After the cam break-in, then the initial oil change, then you can use synthetic oil in your engine. You need oil which has zinc in it so you don't wipe your cam lobes. No, synthetic oil should not be used to break in flat tappet cams.
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