I have been using pennzoil ultra 5w30 since new, no problems. Car has 76k miles. Since the mazda 0w20 came out, I've been wondering if the mazda oil is better suited for the engine. Engine is 2.0 liter mzr with flat tappet and timing chain. The mazda oil has good amount of moly and boron, would that help in reducing cam and chain wear?
Last edited: