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3 Next, the rockers are soaked in a nice bath of oil. This will prevent galling or damage when the engine is first fired up and the oil has yet to get all the way up the pushrod to the rocker. Just make sure you have all the moving parts submerged in oil. We went with Comps own 10W-30 muscle car and street rod engine oil. This stuff is the perfect blend of mineral oil and synthetic juice for our solid lifter non-roller cam since it has optimum amounts of ZDDP (Zinc and Phosphorous).