Castrol gtx diesel engine oil?

[dzsmith]

Im a first time diesel owner. 04 gmc sierra with 137K on a 6.6l duramax. A few of my buddies run rotella. Coming from a gas engine ive ran Castrol my entire life...with zero issues with any engine ive ever owned, all being gm engines. I noticed Castrol makes a gtx diesel engine oil. I see few to no reviews on the oil. Most people seem to stick to rotella or mobil 1. anybody here had any experience with Castrol diesel engine oil

[newdude]

As long as it meets or exceeds whatever the standards were at the time the truck was built, you should be fine. So, a 15w40 API CJ-4 of your personal choice shall be fine. I can tell you that factory fill is Mobil Delvac 1300 to this day. Lots of folks run that, Shell Rotella, Chevron Delo.

[Black02Silverado]

15HDriver covered it well. 15w-40 CJ-4 oil on the market will work well. You can go synthetic but if you don't run extended drain intervals there is no need too.

[dzsmith]

thanks