1998 T600

Don’t know anything about a C12 but that model year predates a lot of emissions issues so it’s probably reliable. I’ve had a 1998 T800 with an M11, 13 speed, 4.33 rear. It’s been reliable. Also had a 1995 T600 with a N14, 15 direct, 3.90 and the only complaint was the T600 mirrors are always needing repair and you have to take the aero skirts off to properly wash the truck

 

C12 is good engine. Horsepower and torque same a that yr c15 weighs 800 lbs less

 

I have same tranny & rears on a volvo d12. I'm got 8.5+mpg with 44Klbs on a dry van with cruise pegged @ 65mpg in Lynchburg, VA (plenty of hills) and 14+mpg bobtail

425HP/1800TQ -- It's mountain specked, so it's pretty quick and has very narrow gear range.

I cant answer the CAT motor side, but tranny & rears should allow a good mpg (I think)

 

C12 has the same HP & T as a C15 say what?

 

marine c12? LOL

 

Go back and look up the spec c12 430 hp and I believe 1750 torque
C15 436 hp 1650 torgue

 

You mean 1650

 

The Caterpillar C15 is an in-line, six-cylinder diesel engine. The bore by stroke ratio is 5.4 inches by 6.75 inches, or 137 mm by 171 mm. The displacement is 15.2 liters, or 928 cubic inches. The power rating when used in a truck or bus is 435 to 625 horsepower at 2,100 rpm; RV and fire truck ratings are 600 to 625 horsepower at 2,100 rpm. The total torque output is 1,550 to 2,050 foot-pounds at 1,200 rpm. Total weight of the engine is 3,090 pounds.