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Thanks for all the information. 2020 gmc 6.2L 100k miles with no noticable issues. According to the service department at the local dealership, the dex ulv is the "same" as Mobil 1 synthetic lv hp. Is this true? He couldn't answer why one is called ulv and the other lv

If I change my ATF to a full synthetic (Mobil 1 or amsoil)from dexron ulv (gm 10speed) do I have to do a full flush? Is there enough ATF leftover in the torque converter and such to make a difference? Are friction additives helpful?

It's a Chevrolet Avalanche 5.3 and 5w30 as per recommendation Up until this episode, never had any issues with the engine, or the dealership when I've had them do oil changes. Since it has quite a few miles on it I figured it finally gave up a seal. It does seem logical that they put in a wrong...

So, after getting my oil changed at the dealership with "full synthetic Mobil One" I noticed a huge cloud of blue smoke on cold start up. 300k plus on the engine and I'm the original owner. Never had much for issues with the engine (jinx), burns some oil when I drive it hard, but maybe a quart...