TDG Mafia # 81
Join Date: Jan 2009
Location: Fort Wayne, IN
Thanked 26 Times in 24 Posts
You can switch back and forth, makes no differance. But when most go syn, they dont go back, unless they cant afford the cost. With a true synthetic, you can extend your drain intervals, and that makes the extra cost more than worth it, plus the added protection of a good syn. Mobil Delvac1 and Amsoil are the best that you can get in my opinion. Those two are Group IV oils and a chemically engineered, most others are Group III and are nothing more than super cleaned petroleum oil from the ground.
2001 GMC 2500HD EC/LB, 4X4. A few go fast goodies. 540hp/1107tq Danville Dyno 11/09, Kennedy 40% injectors.
05 IH 9400i with Cummins ISX pulling a lumber bunk trailer, stuck in a swamp somewhere in Indiana.
Proud Veteran Served 6yrs Active Army From Germany, Kuwait and Bosnia to Ft. Hood and Ft. Knox