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So the lady got a 2004 Yukon and I'm going to change the oil and flush the trans, which amsoil products should I use for her truck? It's a 5.3L.
 

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What he said above and for the tranny, probably their Universal ATF. I also recommend their EAO oil filter as well. I run/use all of the above in my '97 K2500 7.4L and change my oil about once a year.
 

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I run mobile one 5w30 in my wife's Tahoe and we have almost 200k on it and still have 50psi of oil pressure warm going down the road. Never had any motor or trans problems.
 
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