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Originally Posted by 400E
Duke,
Great advice. I have an intermittant lifter tap on start-up. I've thought about switching to a diesel oil but have read that they may clog up the catalytic converter -- is this true? Is this time-related, e.g. OK to use for 5000 miles in a gas engine to free a lifter, but then need to switch back to a non-diesel oil?
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Certain oil additives are known to degrade catalysts. That's why some additive concentrations in modern spark ignition oils have actually been REDUCED from prior API versions, but I don't see any problem using a CI-4 oil for an oil change interval or two, especially if the engine has reasonable oil consumption. I believe some on this board have swtiched permanently to CI-4 oil on their gas engine Mercs.
I use CI-4 oil in my vintage cars that don't have catalysts, but continue to use SL oil in my modern cars with catalysts.
Duke