Quote:
Originally Posted by koihoshi
Frank lee is correct, almost every modern day motor oil for cars has detergents and additives for things like seals. While recycling the oil to clean it may help it, as far as the chemicals are concerned they're not going to be revived through a cleaning process. So by the time your interval is done, I would not put that back in the engine. I try not to skimp on my engine oil.
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Agreed, but you would be AMAZED how long those additives are good for in oil with low acid formation (water in oil causes acid formation). Don't believe me, send a used oil sample in to BlackStone and get a TBN (Total Base number) which is a measure of the remaining additive package. My TBN is only down 4 points after 35,000 miles without a drain.
You'd also be amazed at how that changing oil to frequently increases engine wear (additive pack hasn't worn in yet). Check TDI club for Data here.
You'd also be amazed at the number of very high mileage vehicles have been using very long drain intervals. Met a 5.4 Ford guy with 750,000 miles using 30,000 mile drain interval on Mobile 1 and no added filtration. Know a 7.3 Powerstroke guy with 450,000 Miles on his 8th oil drain on blue jug Rotella T (he does have a bypass filter).
All and all, our assumptions are based on 50 year old data, and lubricant technology has increased exponentially since then.