Mobil 1 is the chit 200k on my engine just replaced head gasket and you could not fell a lip on the cylinders I am the second owner and new the first owner he ran nothing but Mobil 1
good to know about the knocks the problem was indeed a vac leak the egr valve gasket. Appears one bolt didn't make it through the hole in the gasket so one side fell. So it now has the new knocks and egr gasket. I do have a slight tick on # 5 up top hoping that cleans up with the new oil.
Okay so I replaced my intake gaskets because I had to change knock sensors anyway, and I had some bad leaks . The leaks where odd because I had just replaced the head gaskets and intake gaskets. So as it turns out after changing the knocks and installing new intake gasket I have an intake leak...
Cleaned the map today it helped keep it idling long enough to find the vacuum leaks. so now I will order the knocks and goop the hell out of the intake on assemble. I sure this will cure it they are bad leaks both sides of the intake near the middle.
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