I agree with what you say, and additionally a big fail on Volvo's part was recomending a 15,000 mile oil change interval. With high sulfur content diesel fuels in the 80s and into the early 90s, these engines burned dirty by todays standards. That is just too long to leave conventional oil in an engine. It gets contaminated with soot and increase the rate of wear on the engine and specificly on the piston rings. Running conventional oil, the change interval should have been 5k miles with a filter change each time. On top of the crazy long change interval, if I remember right the ownders manual recomends a filter change every OTHER time!!! Its like they wanted the engines to die early!
Jason
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