Oil for High Mileage GMC Yukon XL with 6.2

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You'll have to look for that leak with flash light and a mirror. Could be number of places on the back of the block. China wall is likely... Or could just be back of valve cover(s).

170K you have loosened up a bit. Jena's recommendation is what she has to say. It's good general advice, but stepping up on grade will either slow it, or not... It's a test.

Could also be valve seals. Morning puff is usually valve seals ...
 
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