Date registered: Dec 2005
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Fun oil folklore.
It is interesting to read the stories and superstitions here. My two cents:
1. My Benz (and I assume others) has an 8 quart oil capacity. Thats a LOT more than most cars, and actually double the volume of many cars. What that means is that the oil will degrade MUCH slower and more gradually, and stay cooler. On that basis alone, you can extend intervals.
2. We can change our oil filters without dumping our oil! If you worry about dirty oil, then screw in a new filter after 4,000 miles and rest easy.
3. 3 months/ 3000 miles is marketing hoohah. With good synthetic, and 8 quarts, I intend to follow the computer recommendation, or perhaps change oil 1,000 to 2,000 miles early. I use Amsoil European formula (5W40) but would feel OK with any extended-interval synthetic.
4. There is no proof that using synthetic in older engines will affect seals. If the viscosity is correct, it should work just like dino oil.