Date: 12 Jan 1999 03:26:26 GMT From: Bunny Buster <rthomas278nopsamdnet.att.net> Subject: Re: Any 300K miles engine around? Need real data...
The oil change interval is getting longer for several reasons. The engines are burning the fuel better, with less leakage of combustion byproducts into the crank case. Additionally, the improved emissions systems are doing a better job of keeping the air in the crank case "fresh" leading to less contamination of the oil. Finally the chemistry of the oil additives is advancing, making them more able to absorb the gasses that do make it into the crank case, with out developing damaging acids, or losing viscosity stability. I have 235k plus miles on my 77 pickup with the 20R engine. I change the oil, and filters, and do a tune-up every 5,000 miles. All the cylinders are still within five pounds of the pressure reading I got when I did the first tune up twenty one years ago, and it still passes the smog test with flying colors. I have used Castrol 20-50wt since it was new, (Las Vegas, yes it is hot here). I change the gear lube in the tranny and differential every 50k miles, and have been running 140wt since the first change. I have replaced the front oil seal twice, the water pump twice, alternator once, the clutch once, the front brake pads three times, and the rear shoes once. Today I had to order a new heater valve from the dealer, other than that it has been twenty one years of uneventful reliable driving. Ken Washington wrote: > > In your zeal to respond you got it wrong. In both my 87 900 and 87 9000 > manuals the book says the engine oil and filter should be changed every > 7500 miles or every 3750 miles in severe service. Well, if you have to > do any type of stop and go city driving, even for short periods, or make > short runs that don't allow your car to heat up completely, then it is > considered severe service. That covers the majority of drivers in the US > and a lot of other places. The only exception would be those that just > cruise the highways. > > Ken Washington > 87 9000S > 87 900S > 83 900T
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