I have a very similar truck with a 3126 Cat. The 3126 was discontinued for all its problems but if you take care of it keep an eye on it it should be ok. As for mine I'd like to piss on it and throw it in the lake.
Actually the 3116 was the motor they had so much trouble with. The standard Cat 3126 is still the mainstay of the commercial Marine diesel. This truck is a 3126 E I believe, without going out and looking on the valvecover.
I have always changed the fuel filters when I change the oil. I have always thought that was a little overkill but I have not had any problem with bacteria in my trucks.
Cats are good running motors. I think the cummins get better milage but the they don't have the low end grunt.
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