Transmission fluid in motor

Asked by CatZmess Dec 01, 2016 at 11:35 AM about the 1999 Ford Expedition 4 Dr XLT SUV

Question type: Maintenance & Repair

Ok my Daughters boyfriend recently put "Transmission fluidin my 1999ford
Expedition well we hadto use a funnel it was dark out and so now i was just
lookig under thehood and noticed the dipstick that he put Tranny fluid said
engine oil and on the other side theres one that says transmission oil now
could this be the reason my trucks blown a headgasket?? Now it has water in
the motor oil rusty milky dipstick??

3 Answers
103,435

KenF answered 8 years ago

ATF is a low viscosity oil with a high amount of detergents, a little won't hurt an engine and sometimes is even used as a cleaner between oil changes. If he used more than one quart, I'd get the oil changed. If he added too much, it can let an engine temperature to run higher. Whether that caused your blown head gasket is really impossible to tell, it may have been a contributing factor, or it may not have been.

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F_O_R answered 8 years ago

Just change the oil and filter. I seriously doubt there is any connection to the head gasket failure.

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10

Timmy answered 6 years ago

Agree with both posts.....I've used ATF in the engine of my different newly purchased 2nd hand vehicles to clean tgem out before fresh oil change, ATF high in detergents...Cleaning power just like Guud Ole "Mr Clean"

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