2016 Ford Mustang GT 5.0L V8

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2016 Ford Mustang GT 5.0L V8

Unread post by Cam » Thu Aug 24, 2023 1:01 am

my car has had an issue with burning oil about 1qt a month, I used seafoam in the crankcase by adding it to the oil, I did an oil change drove the car for around 100 miles after changing out seafoam oil and now my car smokes like crazy. the smoke is white and smells of oil, I have catch cans on both of my pcvs and they never fill up. the intake manifold is dry with 0 oil inside of it, I did a compression test (cyl 1:215, 2:215, 3:212, 4:210, 5:215, 6:212, 7:190, 8:190) and used a borescope to look at the piston tops. I cannot figure out the issue I assume it's the rings or head gasket, but I want to have professional input before I pull the motor.

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Re: 2016 Ford Mustang GT 5.0L V8

Unread post by carriedi » Thu Aug 24, 2023 11:39 am

How many miles is a months worth of driving? Using a quart in a thousand miles is not really considered TOO excessive. (by most manufactures) How many times do you fill gas in a month? If you fill up 4 times in a month then add a quart of oil every four fill ups. Way cheaper than rebuilding your engine. and you're sure there's no engine oil leaks? front or rear main seal... Valve cover gasket? Intake gasket? etc.

Burning oil is blue smoke. Black smoke is unburned fuel. White smoke is water or coolant (because coolant is mostly water). White smoke from a cold engine is condensation it the exhaust evaporating. That's why it goes away when everything warms up. Seafoam makes cars smoke. Was it smoking before the seafoam? It takes quite a while for seafoam to to stop smoking. There are some videos on youtube about the effects of seafoam.

If you have a light blue smoke on acceleration, that is usually rings. If you have the smoke on decell it's usually valve guides.

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