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Duramax Diesels

S

SDGREEN

Member
I have been looking at Regular Cab GMC Duramax Diesel pickups and was wondering if any particular year was better than the rest. I was told they made an engine switch in 2006. Can anyone tell me what they did? Thanks for any help.
 
they did change it in 06 it had I think 30 more hp and 50+more torque there was alot of difference in the one I drove compared to the 05
 
Remember this is a relatively new motor, not like the 265-400 small block that has been there since the 50's, so you can expect changes that improve it.
I know a change was made in 2003/2004 cause the parts are for teo different designators (LLY vs something else). I haven't seen that kind of change in the 2006/2007 engines.
BTW I have a 2004 and really like it. I added an Edge chip but didn't need it. That product's only value turns out to be more accurate speedometer and the pyrometer. I find the stock speedometer reads low all the time between 2 and 3 mph.
 
We tow with an 07 loaded 3500 at work and it is a pulling beast. With out a trailer it gets a bit over 20 mpg on the interstate. It has been a great truck so far.
 
Stay away from the 01 thru 03 models. The injectors are under the valve covers and are known for failing and filling the crankcase with fuel. 04 and 05 are good but the best are 06 and early old body style 07. The new body stle 07 and up have the DPF exhust filter and use more fuel. The fuel injector issues aside the Duramax is a bullit proof design and very reliable. Some GM haters claim head gasket trouble but if you look at warrenty claim information that is just not true. The Allison transmission is also the best on the market and with fluid and filter changes will give hundreds of thousands of miles of service. I had a 2003 with the six speed manual and now have a 2008. Both trucks have been totally trouble free with not one warranty or non warrenty repair.
 
At 85K miles, my 2002 got really hard to start and GM replaced all injectors for free. There is a silent warranty on them to 200K miles.
 
The Dmax has a 100k warranty on the engine. All diesel engines produced beginning on 1-1-07 have the particulate trap. Depending on how you drive your DPF equipped truck has alot to do with mileage. The guy who doesn't need a diesel engine will usually see the lowest mileage due to active DPF regeneration. The guy who makes his diesel work a little all the time will rarely have an active regeneration occur and will have better fuel mileage.
Thumb nail sketch is it takes extreme heat to burn the soot in the trap. Under heavy loads the exhaust is hot enough all on it's own. Light usage, short trips, putt putt driving around town the exhaust never gets hot enough on it's own to burn the soot in the trap. An active regeneration dumps fuel in the exhaust stroke heating up the exhaust dramatically to burn the soot.
Don't leave your diesel pickup idling in a field of dry grass, stalks, etc. I've heard stories of fires being started by the extreme exhaust temps.
 
In one of those hot rod diesel pickup magazines. Somebody is advertising a kit to remove the filter and re-program the computer to ignore the trouble codes.
Dyno and road tests found more power and better mileage.
 
Brian: Your hot exhaust comment is also true for most cars with catalytic converters--just one of those little things the mfr's and dealers seem to overlook mentioning in all their advertising...
 
Thanks to all who took the time to post. I have yet to talk to anyone who is not happy with theirs.
 
Yes it will! Excessive idleing (one hour is WAY excessive) will cause unburnt fuel to wash down the cylinders causing excessive wear. Why do you guys have to insist on letting the engines idle all the time anyway? Is it a truck driver ego thing, or is it ignorance? (I suspect the former) When I was driving a truck, one my fellow drivers, whilst laying over at home, let his truck idle for two days (the onboard computer told on him). He was (rightfully) fired.
 
Head gaskets ARE a problem area on them just look at the warranty claims and the bulletins.
100,000 mile engine warranty with a deductable so get rid of them before the warranty is up you don't want to buy the parts and pay for labor big $$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$
 
Mine is a old body style '07 and runs like a scalded dog. Be careful not to overtighten the plastic water sensor under the fuel filter, $80 part that makes them run terrible and start hard when cracked. I love mine, gets 18-19 on the interstate, extended cab 4x4.
 
Other than moving the injectors from onside the valve cover to the outside, was more programing between vin 1, vin 2 and vin d engines. Vin d was shortest produced. Seen many with 150-200,000 miles have had to change injectors on vin 1 and vin 2 because of injector leak. If under 100,000 and leaking into pan will usually cover under warranty with $100.00 deductable. Have not seen any headgasket issues on 2500 through 6500 series. Best in humble opinon is 06 or 07 classic produced befor 01/07. Had the Vin D engine.
 
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