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ISX vs DD15 vs C15

Hi guys,

I will be buying an 08 or newer truck thanks to california. I will be running through and picking loads from california.

I have been looking at 09-10's. Was wondering what experiences people have had with the dpf and motor combos....like the dpf and isx, dpf and dd15 ... an so on...

I know that if you got a detroit you will think thats the best and if you're a cat guy, then c15 is the best...

There are a lot of isx's on the market with the dpf's and the only bad thing i can come up with is that they have been know to go through egr's and turbos...any truth?

I guess there was a lot of problems with 08's, but I figure that if i were to find one with 550k on the clock or a bit more, most of the problems are probably worked out and software updated? I can't afford newer than 2010 so I will go either 2010 pete 387 isx 13spd 3.36 rears or 09 cascadia dd15 13spd

I understand that there are many factors but there has to be a motor dpf combo that stands out and out performs with the best fuel mileage stock? Like I said there are many factors that will affect this, but a general idea is what I am asking for...

thanks guys

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I have in depth knowledge of both the cat and cummins spent four years working on and specializing in EPA 07 and 10 emmisions . As a cat guy it really pains me to say this but stay away from SDP C15 engines. They are the nightmare everyone says they are. Cummins after treatment is designed much better my only suggestion is follow the maintanence schedule exactly if it says clean the dosing valve (you find out what that is) clean it. Says clean the catalyst and dpf clean it this will greatly reduce un expected down time . Try to idle very little . Turbo's egr valves coolers all that stuff will be a problem but all I can say is welcome to 2013 truck engines . The problem with the cummins IMO is that if you spec the engine for after treatment reliability fuel economy will suffer and vice versa. What I mean is if you keep the 07 isx working I.e. pyro temps up the dpf can regenerate without doing an actual regen. Also the harder you run it you stand a lesser chance of the variable turbo sticking and binding because it will be moving and doing its job. And light duty cycles can cause the egr cooler to soot up and plug. Now the best way to get economy we have learned is to keep boost and pyro low so you can see the confict

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I'd pick the pete with the isx engine. The cascadia might get better fuel mileage (maybe) but if you need a truck for california the 2010 will be legal there much longer than the 2009. When it comes to engine issues...nothing's changed. You'll see new trucks torn down at both freightliner and paccar dealerships.

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STAY OUT OF CALIFORNIA!buy a truck that won't give you problems.the trucks you are looking at are a nightmare.i like cat up until 2007,but don't like the twin turbo system 6nz would be my goal on this.my truck is a 1995 5ek engine 3406e block.

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California is going down . They require all the trucks to have DEF ,also reefers may need DEF. No money in California anymore for truckers.

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I had an '05 ISX. For what it's worth, I have never driven anything except Cummins in my 21 years of driving so naturally, when I bought my first truck I opted for the ISX. EGR after 180k. At 595k a wristpin circlip dislodged and destroyed the block. Reconditioned block and brand new head for $25000 and 400k miles later I broke the crankshaft in two. I don't beat my truck. Never have, never will. But I will never own another Cumapart.

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