Re: Newer Oils in Older Engines
If you do some research you will find out that roller lifters were used on the 3.8 V6engines from 1986 on up. I've experieced a flat cam in my Jeep at around 3000 miles after installation, only used a zinc oil during initial break in. That point on I have used oil with zinc or poured in the additive, there's no need to take chances when so simple just to spend a few extra dollars for the additive or an oil that has it.
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