Oil consumption in 1966 Mustang 289 with no visible signs of where it is all going!
Discuss Oil consumption in 1966 Mustang 289 with no visible signs of where it is all going! on AllFordMustangs.com, the place for Mustang enthusiasts.
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Unless you (or someone else) caulked the mating surfaces and the inspection cover AND it all held oil tight AND the rear seal was leaking - it's not possible. Pig's pulling your leg. I have, however, heard of old 8N tractors geting the weep hole in the bottom of the case pugged up and accumulating quite a bit of oil that the rear seal leaked so the concept is real just not at all likely.
What is "normal" oil consumption is always a hot topic of debate...some would say over a qt every 1000 miles is "too much", some would say "normal"...
4 quarts in 2000 miles would probably be excessive in most peoples book...I'd watch it more carefully and not panic...
My Infiniti uses a quart about every 750 miles...they have lightweight racing pistons and are know to use oil, ...my Cobra uses almost no oil.
It is not uncommon for a rebuilt engine to go through a couple of quarts of oil per 1000 miles. If chrome rings were used then they might not have sealed. Burning one quart of oil every 500 miles will not be decidedly noticeable. After 2000 miles it may be fine now. Check the engines condition with a leak-down test but I doubt you will find anything wrong. Change the oil and filter, as you should have after the first 1000 miles, and then monitor the oil at 500 mile intervals to see if you are still losing oil. While checking your oil watch for obvious leaks at the filter, drain plug and rear of the pan. Some leaks only happen while the engine is running so if you had a minor leak it may not have shown up on the floor of your garage. It might be spread out over miles of road that you drive.
1966 Coupe 351W Top Loader rebuilt, rewired, modified for slalom and hill climb No racing - just a fun car built by and for me. Project in process
He said that it smokes for about 5 min. when he first starts it. That is usually an indication oil is leaking down past the valve guides while the engine is off. 4 qts in 2000 miles would be a lot of leak, but on a fresh re-build I wouldn't be happy with poorly sealed valve guides, even if it only accounted for a little of the oil loss.