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Good Truck!

lunytnz

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lunytnz Enthusiast

lunytnz

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Posted

I was talking with a buddy, just the other day, and saying that my truck has been a pretty good truck.  I have the Yukon SUV and I have over 200,000 miles on it now. It's a 99 and I've owned for almost 20 years.

I hasn't been flawless, but (overall), it's been a pretty good truck.  When I bought it, I would never have expected it to make it over 200,000 miles without a whole host of major issues.

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      By newdude · Posted

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    • Grumpy Bear
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      By Grumpy Bear · Posted

      Do you know WHY the filter relief setting was increased to 22 psig?    When the new system goes into the second stage the pump volume ramps up considerably. It was found that the 15 psi filter bypass setting put the filter in bypass on a warm engine when the second stage was activated. Raising the filter bypass setting forced the filter to do what it designed to do. Filter. Preventing debris from circulating during high load, high rpm operation.    So next question is how did GM find this out? VLOM/lifter failures and a deep dive by Melling Corp.    Last question. Is it required? Look at it like this; a motor may be equipped with a rev limiter. But it only works if the set point in reached. That 22 psig setting only matters if the pressure differential across the filter media exceeds 15 psig during normal warm operation. Second stage kicks in around 3000-3500 rpm.    I can't answer your question because I don't know you and how you use the truck. But I think there is enough information here to let you decide for yourself. 😉
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