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Old 06-24-2013, 21:01   #1 (permalink)
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oil thinning fast

Have 1980 F250 351m It seems that my oil is thinning and the oil level is going up on the dip stick. Would this be the gas needle and seat in carb or the power valve in carb dumping gas in the oil?
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Old 06-25-2013, 03:48   #2 (permalink)
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Re: oil thinning fast

Does the oil small of gas?
Is your gas tank level dropping faster than normal?
Engine run rich, smoke and hard to hot start?
Plugs fouled?
If yes, it's a good bet gas it the reason.
Good luck.
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Old 06-25-2013, 04:49   #3 (permalink)
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Re: oil thinning fast

The oil level rising on your ford is a normal condition and is caused by the DPF cleaning process. Extra fuel is needed to clean the DPF, and it is not all burned and ends up in the crankcase. You see this more on short trip trucks because they get locked in regeneration. There is a Federal mandate that the regeneration process has to be completed within 699 miles, or it will lock in regeneration. On short trip trucks, the process will start and not finish, and this cycle goes on beyond 699 miles it locks in and a manual regeneration has to be performed. If a regeneration process has started, and the vehicle is put in park the process will stop and have to be started over.
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Old 06-25-2013, 10:35   #4 (permalink)
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Re: oil thinning fast

A 351M is a gas motor.
I don't believe there is any cleaning process on this motor.
Good luck.
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Old 06-25-2013, 13:06   #5 (permalink)
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Re: oil thinning fast

Yes All of the above. Hard to start when hot,oil smells like gas.Plugs do not foul and no smoke. Would a power valve dump gas?
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Old 06-28-2013, 15:20   #6 (permalink)
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Re: oil thinning fast

Sounds like the gas is not coming through the intake system but from a fuel pump leaking directly into the crank case.
It seems that no plug fouling and hard starting don't go togather if excess fuel is from the carburetor.
Usually the plugs get wet with that much fuel.
A way to tell is floor the throttle when cranking.
If the engine starts quicker, it's to much fuel from the carb.
That much fuel through the intake washes lube from the cylinder walls and allows excessive ring and wall wear.
To much in the fuel is not good for the rest of the engine bearings and seals.
Good luck
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