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Another typical oil thread argument.
Biggest waste of time is agonizing over it. Just buy a good name brand oil which is of the viscosity appropriate for the season the oil will be used in. If you don't change it very often (because it isn't used much) I'd recommend 10w40 as a good all-around oil, unless you live in extreme temp areas (far north or south).
A couple favorite brands would be Penzoil or Castrol.
If you want to run synthetic you can do that, there are some pluses to running it, but I would insist that you can run the engine for more miles if you use it, probably twice as long. It costs twice as much, so might as well get something "tangibile" for what you are spending.
For change-out mileage specifics, what I recommend and has always worked well for my vehicles, is change the oil based on 1000 miles for every quart of capacity, so if your 300se takes I believe 6.5 quarts, go 6500, or if you run synthetic I'd go twice that, 13000.
Gilly
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