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I have never verified this myself, but I've read that switching to synth in older cars might introduce leaks in places where leaks previously didn't occur. The smaller molecular structure of synthetic may allow oil to seep past old seals that dino oil wouldn't penetrate.
Otherwise, there shouldn't be a problem. If you change oil frequently however, I wouldn't waste the extra expense...
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2009 ML350 (106K) - Family vehicle
2001 CLK430 Cabriolet (80K) - Wife's car
2005 BMW 645CI (138K) - My daily driver
2016 Mustang (32K) - Daughter's car
Last edited by G-Benz; 12-19-2006 at 10:32 AM.
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