X gasser

[stigy]

Breaking in a new Duramax, Shoot me for not doing it sooner. The '08 is a one heck of a Truck, way far better then the '04 6.o L. I'd like to switch to syn. Amsoil as soon as possible. 1200/1500 mi. any problems???

[gr8shot]

welcome!!! It depends on who you ask... lots of different opinions. Some people will say wait til its broken in (20-30k miles) some will say go for it right away. Do what ever your comfortable with. I know that you should expect your mileage to keep gettin better the more miles you put on though. Good luck!!!

[vin63]

X2...you can change over whenever you feel comfortable. Some people, including me, waited for 1K miles, or so, for most of the assembly debris to dislodge - similar to some of the recommendations of waiting 5K miles to change out the gear lube and the Allison spin-on filter.

I have a lot of left over, unopened Amsoil DEO 5W40 Premium in the gallon size. If you need three gallons, I have some for pretty cheap - it's just taking up room in my garage.

[n0useforaname]

I would wait a bit and let your engine break in. I know Syn. is supposed to be better than regular oil...but it won't hurt to wait a bit. My uncle only runs regular oil in all his diesel trucks, and he has over 200 thou. on all of em.