Join Date: Mar 2010
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the 3126 cat is a strong engine, they start well in cold weather reasonably reliable the only problem is some injector problems, of which you shouldn't have any problem if you stay up on oil changes the fuel system is run of oil pressure much like the ford powerstroke. the oil capacity is 5 gal so you don't have to change it every 3000 miles but try not to stretch it over 7000 miles. The fan hub has to be greased manually there is a grease Zerk is visible from the drivers side. GM however only bought the programming from cat to obtain a max road speed of 75 mph from 00 up 70 mph from mid 98 to 00, but according to what you are saying about the engine tag of max 330 hp you should already have every thing in the engine (injectors, damper,turbo and such) to obtain that 330hp by purchasing the program from a cat distributor, you will have to pay a EPA charge for higher hp programming. They also can be reprogrammed to run a max speed of 83mph how ever that program is relatively expensive I believe in 00 when i purchased my truck new cat charged me about 1800 dollars to reprogram just for higher road speed they did not change the hp rating at all. Over all I like the 3126 over the isb Cummings especially those models of isb's and isc's that had the caps style fuel pump I think 98 through 01 may be even 02, but properly maintained the 3126 will live quite long Ive got 300,000 miles on my truck now and it still runs strong.