Quote:
Originally Posted by t walgamuth
everybody with experience knows that tired worn out oil will run through an engine a lot quicker than good fresh oil.
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You might find this tidbit interesting. It's a bit of anecdotal evidence to the contrary.
The SD always consumes about 1 quart every 2K miles after an oil change. It's pretty consistent right through 4K miles. However, as I near the oil change at 6K miles, the consumption has decreased to almost nothing. I'd hazard a guess that it consumed about 1 pint in the final 2K miles.
This is not to suggest that delaying an oil change is a good thing. However, the viscosity increase of the oil as it ages must have something to do with the decreased consumption.