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SPEEDER51

Member
BEEN RUNNING THOR OIL. FROM WHAT I'VE BEEN READING IT PROBABLY WASNT THE WISEST CHOICE BUT IT IS WHAT IT IS. WANTING TO SWITCH TO 4T NOW AND I'VE SEEN WHERE WE SHOULD THROUGHOULY FLUSH THE MOTOR BEFORE SWITCHING. WHAT EXACTLY NEEDS TO BE DONE? TIA
 
I would drain the dirty oil, then refill with 50/50 mix of clean oil and ATF. Run NOT HARD until that oil is warm then drain again. Ever looked inside a used automatic transmission? Very clean because of all the detergents ATF has in it. Drain completely the make your switch.
 
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