The factory recommended oil spec and change interval should work just fine. But synthetic oil offers reduced friction, lower bearing temperatures, and resistance to breakdown. I know of some lab tests that showed 80% of the added benefits of using synthetic oil can be obtained by using a BLEND of 20% synthetic / 80% fossil oil. So if you want most of the benefit of synthetic at a nominal price MIX 1 quart of Mobil 1 synthetic with 4 or 5 quarts of regular Mobil oil. This is essentially what you are buying when you purchase the "synthetic blends" only the price differential does not reflect it. Oh, and don''t mix brands as the additive packages may not be compatible with each other. It is OK to switch to synthetic after using regular oil too.
