- Apr 22, 2003
- 936
- 0
- 0
my friend works at a dealership and hooks me up with free oil changes. i guess he started putting in synthetic oil (mobil one) at 5-6k. i heard people recommend that you not switch to synthetic until after 10k and was wondering if anyone knew why and how it might affect your car if you switch over early. i know its not going to blow up or anything but was just wondering about the rational behind the 10k wait. thanks.