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Originally Posted by coloradotaco
I've been using Mobil 1 10-30 since day one on my '95 GT. It has 138k on it now and doesn't use any oil. I change the oil every 3-5k miles. I stay away from the basic Fram filters. I go for the tough guard or Purolator since they have a check valve in them to help prevent oil starvation at start up.
I think the synthetic holds up better between changes then conventional oil. I don't think there is a performance gain over clean conventional oil.
I've heard that you don't want to switch to synthetic oil in older engines as it may cause leaks. I don't know if its a fact though.
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Good mention about the Fram filters, definitely stay away from them!
Also the reason people say not to run synthetic oil in cars with higher mileage or cars that have been running convention oil for a long time is because, since synthetic is man made, all the molecules of the oil are the same. Whereas the molecules of conventional oil will vary in size just because of it's molecular structure. Now if you have an older motor, you may have developed a very minuet leak in a gasket which is not noticeable, and the molecules of the conventional oil will actually fill in where the gasket is weak and will not pass though. Synthetic oil, since it's molecules are the same size can actually penetrate though small, weak spots that conventional oils won't, and possibly causing a small oil leak. Now that I have totally confused everyone, I'm done.