How do you change from mineral oil to synthetic oil?

Yes. The only downside to running synthetics is a potential for old engine seals starting to leak due to varnish build-up being removed by the synthetic oil additives. Other than that, you can swap...

I change it every 5000 miles. That's the factory recommendation. My dad used to change the filter every 5000 and the oil every 10,000. I figure changing oil is cheap insurance. A penny a mile is not...

For synthetic oil... up to 5000 miles

Oil changes are always necessary. If you mean can you mix conventional oil and synthetic, the answer is yes you can.

As long as it is not a requirement of the engine, such as with VW's, Corvettes, Vipers, Mercedes, and some other higher end cars, then there will be no problem. So if you have an Accord, like the...