I do my first oil change at ~ 2,500-3,000 miles and switch to a full Syn at that time. I do not believe in changing out extra early and in some engines that can be dentramental. I keep my cars to 125,000 miles pluse and several were sold at 176,000 miles without any oil related issues. Works for me on Jeep 4.0, Slant 6 Dodge, Volvo, Subaru, and on and on. My normal OCI is ~ 6,000 with a OEM or PureOne filter. Excellent UOAs after breakin or about 12,000 miles. I also feel you will never go wrong just following the factory recomendations. Ed