Having looked over the info regarding old oil being able to protect better than fresh oil (a severely debatable point, I realize)...
I just wonder, assuming that the old oil argument is correct... I wonder if you could get the best of both worlds by doing a partial oil change?
In a 5 quart engine, you could pump two or three quarts out through the dipstick tube, and replace them.
Then change the oil filter at the next interval, and maybe pump out and replace 2 quarts...
I thought of this because in my 1993 Ford Escort's earlier years, it was burning about a quart of oil every 1000 miles. Therefore, I figured I was getting an oil change every 4000 miles or so just by topping off the burned oil.
But that was pre-AutoRX for my car, and now at over 225,000 miles it really isn't burning any significant amount of oil, so I'm doing regular oil changes at 4000 to 5000 miles.
My point being that engine really lasted a long time on pretty much no oil changes at all (pre-BITOG days) So the used oil idea seems plausible to me. If used oil didn't work well, my little Escort would have escorted its last about 100,000 miles ago...
Advantages... you wouldn't have to put the car on ramps and get under it (except to change your oil filter as needed, and a good filter ought to last for 10,000 miles or more (based on the extended drains we see here in the UOAs).
Just a thought...
Dan
I just wonder, assuming that the old oil argument is correct... I wonder if you could get the best of both worlds by doing a partial oil change?
In a 5 quart engine, you could pump two or three quarts out through the dipstick tube, and replace them.
Then change the oil filter at the next interval, and maybe pump out and replace 2 quarts...
I thought of this because in my 1993 Ford Escort's earlier years, it was burning about a quart of oil every 1000 miles. Therefore, I figured I was getting an oil change every 4000 miles or so just by topping off the burned oil.
But that was pre-AutoRX for my car, and now at over 225,000 miles it really isn't burning any significant amount of oil, so I'm doing regular oil changes at 4000 to 5000 miles.
My point being that engine really lasted a long time on pretty much no oil changes at all (pre-BITOG days) So the used oil idea seems plausible to me. If used oil didn't work well, my little Escort would have escorted its last about 100,000 miles ago...
Advantages... you wouldn't have to put the car on ramps and get under it (except to change your oil filter as needed, and a good filter ought to last for 10,000 miles or more (based on the extended drains we see here in the UOAs).
Just a thought...
Dan