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  1. #1

    Default Break in and Follow on oils

    Ok another wierd thread.

    After rebuilding my 5.7 vortec in my 96 chev suburban 1500 the guy who did a lot of the machine work talked me into using the Joe Gibbs Break in oil (and since I kept my roller cam untouched and reused the hydraulic lifters) for 200 miles then change the oil/filter but to go with Joe Gibbs Racing oil. He talked up the Zinc vs detergent issue and all that so I did what he recommended.

    Now i've been reading that the high zinc oils like Joe Gibbs Racing oils can and will foul up your catalytic converter in the everyday non-high performance engines. I just did my initial change after the break in and am running this JG racing oil now.

    Question: 1. Is this oil actually BAD for these roller cam engines and their emissions systems?
    2. Should I get it out of my suburban and if so what do you recommend I run?

    Thanks again Everyone.


  2. #2


    Roller cam engines don't need all the zinc. Just use a good quality synthetic oil like Mobil1. And no crap filters like Fram.
    When you hear hoofbeats, look for horses not zebras.

  3. #3


    Thanks 2COR. That's what I thought. I'm gonna get that Joe GIbbs out of there in about a month.


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