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Originally Posted by Duke2.6
Another alternative is to use a HD diesel engine oil (API service categorty CI-4) like Chevron Delo, Shell Rotella, or Mobil Delvac. These oils have a higher dose of detergent additive than oils blended for spark igntion engines (API SL) and have been reported to free sticky rings and lifters.
The common multi-viscosity grade for these oils is 15W-40.
If a lifter taps all the time its probably collapsed and needs to be replaced. If it only taps mostly when cold, it's probably partially clogged and might free up with a heavy dose of detergent.
Duke
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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?