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TOW VEHICLE
You've got six speeds to choose from and a power band that puts me over 600 ft./lbs. of torque from 1,600 rpm up to the governed 2,900 rpm on the 2005 models. That should be plenty of power band.
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In my reading on the subject of oils, the common wisdom is that turbo's are really hard on standard motor oils.
It seems synthetics withstand the ultra-high bearing temps better without cooking off. And it also seems like a good idea to let the turbo's spin down to idle before shutting off the engine.
Art: Have you tried synthetic oils in this application?
Or how about an auxiliary external oil pump to circulate the oil before and after running the engine?
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The oils we are using are designed for more then we could ever give a truck other then for field use. They don't seem to breaking down. Local large truck dealers have varified these same failures on there version of these engines.
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Randy, I realize they have 6 speed trannys, my Ford does too, but that in reality is only 4 forward gears since one is a bull-low & 1 an O/D. The problem is the spread between the gears, they bias the spread to suit 'average' driving, pulling loaded tri-axle or tandem duals float out the back is hardly 'average'. With my medium duty, there are 10 forward speeds, excluding bull-lows or O/D's. The torque ratings, according to Cummins, are only to about the 2,400 rpm point, after that they fall off rather dramatically. That means it's only making big torque over an 800 rpm band at best.
Mark, the oil suffers even more abuse in a PSD since the oil is also used as hydraulic fluid in the 'direct injection' fuel injectors. Anti-foaming properties are so critical that you can actually feel the power loss if you use the wrong oil or it is due for an oil change. The use of synthetics leads to longer change cycles and even more deterioration of the anti-foaming additives.
Art, maybe it's just 'Murphy's Law' working in reverse but we haven't really had any of those problems. We have had a couple of the torsion springs in the clutches fail, but they were covered under warranty, no questions asked.
Best of luck.
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In my hot rod days I retrofitted turbos onto a couple of cars. I can't speak to the other failures but pre and post oiling is critical on turbos regardless of the oil used. I thought most manufacturers were already using them in production vehicles but maybe not (IMHO they would be stupid not to). In my experience in Arizona (where everything runs hot) I used to have the turbos rebuilt every 25k miles or so due to bearing pack failures, even when running synthetics and changing oil every 3k miles. The oil would cook off and oil lines and fittings would coke up. After adding pre and post oilers I never suffered another failure. Dana makes a nice setup for diesel engines I believe.
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I can see the very first few posts more than likely spooked most others away from posting but I just saw this and will chime in. I have not been pulled backwards down a hill yet but I do use my silverado K1500. Of course I dont pull for a living and dont own any buisness but do occasionally have to tow a load or two. In my opinion, from my experiance, for the "occasional puller" Nothing wrong with a half ton. Of course I would like to have ,more power and weight but the other 150k miles that I put on a truck "including trying to park in a comercial parking lot) I dont mind my truck at all.
See guys???? it dont hurt to admit it!!!!
Yes my name is TOM and I pull with as 1/2 ton truck.
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