ok. i got my 92 mustang with the stock 2.3 L 4 cyl. engine. we loked at the coolent and theres all this brown sludge in it. i need to know what type of coolant to use in it. i have some yellow prestone and dex-cool but have no isea what to use in it. need help.
Fords built in the early 1990s typically used the 36K mile green antifreeze
Yup, green is a go, (50/50 mix of antifreeze and water) but the sludge is what worries me, make sure to flush the cooling system, replace the coolant, bleed the system and then check for cold spots on the radiator.
The sludge might be oil, so a pressure test wouldn't hurt either.