I've run synthetic in any car I've owned that didn't leak oil for some years. Never have had one spring leaks after the change.

If you do change from dino to synthetic, change the oil filter again after 500-1000 miles, all the varnish will dissolve and particulates will plug the filter.

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!