X15 500E or X15 505P

I've got the efficiency x15 in a car hauler and I couldn't be more pleased with this engine. Not one issue in the first 123k miles. Doesn't leak, doesn't burn oil and gets pretty good fuel economy.

 

What’s the difference in price ...?


And the extended warranty price difference..?

 

Regen intervals will be the same with either one. Expect around the 100 hour mark as they are timed unless conditions dictate it is needed sooner. The major difference being the performance uses the Nexgen fuel pump. Economy series used the same old pump as the ISX but with all the upgrades. Haven't seen a ton of issues with either one. Turbo speed sensors, and some engine harness issues come to mind.

I doubt you'll notice much difference between the two engines/ratings. I can tell you most vocational trucks I see are spec'd with performance. Linehaul is economy.

 

both engines have separated from engine lubrication fuel pump lubrication ?

 

Both fuel pumps are still lubed with crankcase oil.

 

then why they say that in case of fuel pump failure debris will not go to engine.

 

Whose "they"? The pump parts failures on the 2250 is old news. The change to the oil system was a redesign of the oil bypass valve which the old plastic valve and spring was allowing metal from the failed pumps past it and taking out the #4 main bearing. This is the change that was made to prevent progressive engine damage. Plus upgrading the parts In the fuel pump. Tappers and plungers to titanium.

 

I assume the only real difference is that after the warranty expires, you won't be able to crank the Efficiency up to 605hp/2050.

 

Whats considered pretty good fuel economy for car hauler ?