I screwed up and put in 10w-40 on my last change, and Yes it does make a difference. My lifters have gotten noticably louder and it seems to take longer for them to quiet down. Changing back to 5w-30 today.
CSAMOS2.... DO NOT use the ATF until you are ready to do your next oil change...You should not be going too far with the ATF in there... 20 miles max.... It will really clean the engine out, but does not have the same lubricity as motor oil....
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