got a 2000 f-150 with a 5.4l. here recently started to notice that was using more than normal amount of oil. to be exact about a half quart every 1000 miles. i was running mobil 1 5w-30 synthetic in it. i took it to the ford dealer, and they called ford motor company. ford told the mechanic to drain the mobil and install motorcraft, due to the fact that supposedly mobil1 burns faster. i found that hard to believe, but agreed to let ford perform the oil consumption test anyway. they told me to drive about 1000 miles and bring it back to them. i did and still the same results. i lost about another half quart. i have to take it back today for compression testing. looks like its burning more than normal amount of oil but knowone knows where it is going. no leaks, nothing obvious. if compression test fail, looks like a possible new engine.

anyone else have this same problem, please let me know..

thanks!!

 

Its not the Mobil 1. I have run it for years in all different kinds of cars and trucks, have never had an excess consumption problem, if fact seems to me it uses less of it when I have converted older higher miliage cars from mineral to synthetic.

 

Oil gets out of the engine in one of three ways. It leaks out. It sneaks by the oild rings and gets burned up. It sneaks by the seals on the valve guides and gets burned up.

It seems that a leak is unlikely although you might carefully check your valve covers to see if you have a leak that is dropping onto the exhaust manifolds. The oil would not leave a puddle on the ground, although it would seem that the smell of burning oil would be obvious when you stopped the truck.

The compression test should be run straight up, and then again with a small quantity of oil in the cylinders to determine if it is the rings or valve seals. But, a compression test may not tell it all. You could have good compression and bad seals on the valve stems.

I'd go for the new engine.

 

I noticed that my first 5k miles using dino oil, no consumption at all. The second 5k miles using Mobil 1 I used about 1/2qt in 4kmiles so far. I've not had a car in years that ever used any oil between 5k changes. I may not have given it enough breakin time on dino oil, only 5k miles. I'm thinking of going back to 5w20 dino for at least another 5k and see what happens.