[quote=choctaw;633442]I think the he is probaly right. With your logic Big it would be the same as changing your oil and then topping off with 3 quarts of used oil. Because just draining the oil does not clear the upper. It would take several oil changes to clear the upper and you would still have old oil in the upper. I'm not trying to argue,
I'm saying it seems it would be the best idea to change the upper and lower at the same time every time.[/QUOTE]
Thats basically what I was saying choctaw. But even then you still have contaminents in the oil pan and in the hpop system. You would have to do alot of flushing to remove all that. I mean ok 3 quarts of oil, how many flushings would it take before all that used oil residue is removed. I would guess that would be alot of oil wasted just for the flushing to obtain 100% contaminate free oil system.
I do understand what he is saying. But unless you have the electric vaccuum pump it would be awful hard on your hand trying to use a hand vaccuum pump. By the time your done you would need to see an orthopedist for carpal tunnel syndrome.