Crimminy, when will that stupid rumor finally die? Synthetic oil DOES NOT CAUSE LEAKS. The seal shrinkage problem was solved in 1972, and NEVER affected oil sold to consumers. Sigh. At least the old cogers don't try to get you to use single weight non-detergent oil anymore.....

You want to use synthetic because it will make your engine live forever rather than grinding the cams flat by 160,000 miles.

It really does work, it very greatly reduces wear, and it costs almost exactly the same as changing dino oil every 3000 (or 2500) miles.

Peter

__________________
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!