Synthetic oil sticks to metal, dino doesn't, so the tensioner won't drain down so fast. Synthetic is also much more viscous at high temps, resists draining for that reason too.

Peter

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1972 220D ?? miles
1988 300E 200,012
1987 300D Turbo killed 9/25/07, 275,000 miles
1985 Volvo 740 GLE Turobodiesel 218,000
1972 280 SE 4.5 165, 000 - It runs!