5.0 oil question - Vintage Mustang Forums

 
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post #1 of 3 (permalink) Old 04-11-2017, 01:49 PM Thread Starter
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5.0 oil question

Let me start with the disclaimer: I have not yet changed the oil to see what's going on.

I've got a low mileage (55,000) engine that has been maintained its whole life. The oil pressure seems to be a bit low on the notoriously questionable factory gauge. There is no smoke that I've seen coming from the exhaust. When I started it cold, I did see some smoke come from the engine compartment. I have not noticed any smell to indicate an oil leak and there was no evidence of any that I have seen. I am convinced that the exhaust donut is long gone from the sound of the exhaust and suspect the smoke I saw came from there.

Knowing what I've just shared, what would your recommendations be regarding oil and things to keep an eye on?

1970 Mach 1 M code
1990 5.0 LX Limited Edition

I keep noticing the DOT puts up signs to honor my burnouts. That's nice of them.
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post #2 of 3 (permalink) Old 04-12-2017, 11:35 AM
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When engine is cold - leaking oil can't burn/smoke (until exhaust gets hot)...


A worn valve seal may leak oil into a cylinder after shutdown and the smoke is visible at start up - especially if the exhaust donut is gone...


Me? I would have someone else start the car while I watched under the hood for the source of smoke.

Daisy is a 1967 Coupe
Painted Frost Turquoise
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White Vinyl Roof
Deluxe Interior
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(And that big ol' 390 Engine )

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post #3 of 3 (permalink) Old 04-18-2017, 08:20 PM Thread Starter
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Well, I decided to change the oil. I might have found the problem when I drained 6-7 quarts. I suspect the pressure will stabilize pretty quickly.

I also found the exhaust pipe completely cracked open behind the cats, so the donuts may just be fine.

1970 Mach 1 M code
1990 5.0 LX Limited Edition

I keep noticing the DOT puts up signs to honor my burnouts. That's nice of them.
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