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An alcohol based fluid that is miscible in water and used to remove heat from the engine. Also see the [cooling-system] tag for related components such as the radiator and water-pump.

25 votes
12 answers
288k views

Is Prestone "All Makes/All Models" coolant *really* compatible with all models?

My car's manual says to use the blue Honda coolant: Always use Honda All Season Antifreeze/Coolant Type 2 [MSDS]. This coolant is pre-mixed with 50 percent antifreeze and 50 percent water. … On the other hand, Prestone claims their green coolant is harmless: Prestone® Extended Life Antifreeze/Coolant is compatible with ANY antifreeze/ coolant – regardless of color – for use in ALL makes …
endolith's user avatar
  • 1,351
1 vote
1 answer
13k views

Oil in coolant recovery tank, how urgent is it?

, and pulled out black goop floating on the coolant. … A little deeper is clean coolant, and the coolant in the top of the radiator is clean. The oil level is normal and doesn't seem frothy. I did recently get a pending check engine code P1??? …
endolith's user avatar
  • 1,351