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Old 07-04-2011, 10:23 PM   #71
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Thanks to everyone who picked up on the topic of mpg for a Duramax. My 2008 is totally stock. It is a 4x4, standard bed. I keep reading about the chips that improve mileage and power. Also, is there any benefit in getting a "better" air cleaner that breathes better and that could be re-used by washing? Would synthetic oil improve the mileage and go longer between changes?
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Old 07-05-2011, 07:34 AM   #72
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Originally Posted by flyingfinn View Post
Thanks to everyone who picked up on the topic of mpg for a Duramax. My 2008 is totally stock. It is a 4x4, standard bed. I keep reading about the chips that improve mileage and power. Also, is there any benefit in getting a "better" air cleaner that breathes better and that could be re-used by washing? Would synthetic oil improve the mileage and go longer between changes?
I would recomend KILLING the DPF and getting a real HP TQ jump.
K&N type air filters pass more silica because of their bigger pores,
keep the stock air cleaner, its best for your use.
If you want to go to a high quality oil get dino LE or synthetic Amsoil as they are the best, period!
You can safely extend your drain intervals 3 times with those 2 oils.
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Old 07-05-2011, 08:58 AM   #73
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Just went out and looked at our 2011 3500 Denali SRW standard bed crew-cab for tire type. They are Michelin 265/70-18 LTX AT-2 LRE 124/121R Made in Canada. It appears the 2500HD's (both Chevrolet and GMC seen at the dealers) get Good Year or Bridgestone somethings. The 2500HD Denali's get the five spoke polished Aluminum wheel (shown on brochure and web site) but the 3500 Denali's get a different polished Aluminum wheel that looks different than the standard wheel on the 2500's. I was expecting the five spoke wheel and probably Bridgestone or Good Year but when we picked up the truck at Sierra Motors in Jamestown, CA but it had these different wheels and Michelin tires. I was happy! I saw a Chevrolet 3500 dually at the local dealer when I was getting my oil changed Tuesday and it also had six Michelin LTX AT-2 tires, don't remember looking at the size. So I guess the 3500's are getting Michelin and the 2500's get Good Year or Bridgestone. Ours is coded for GVW rating of 11,500 lbs. and that may also key in a different wheel and tire for the 3500 model.

Paul
On the HD's we build at Fort Wayne, the 17 inch standard tires are Bridgestones, the 18 inch optional tires are the Michelins, and the 20 inch optional tires are the Goodyears.
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Old 07-05-2011, 09:32 AM   #74
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My understanding is that the regular cabs and crew cabs are built in Flint, and the extended cabs are built in Fort Wayne. Is this correct?

Brian
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Old 07-06-2011, 02:42 PM   #75
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Originally Posted by flyingfinn View Post
Thanks to everyone who picked up on the topic of mpg for a Duramax. My 2008 is totally stock. It is a 4x4, standard bed. I keep reading about the chips that improve mileage and power. Also, is there any benefit in getting a "better" air cleaner that breathes better and that could be re-used by washing? Would synthetic oil improve the mileage and go longer between changes?

There are many companies that market chips or programmers for the 2010 and earlier Duramax. GM believes these programmers increase horsepower and torque beyond the design limits of the engine. When a customer brings their Duramax in for warranty service on the engine/transmission, the engine control module (ECM) is checked for the presence or history of a chip or programmer. If the ECM’s programming has been altered, the remaining powertrain warranty will be canceled. On the 2011 Duramax, GM has blocked access to the ECM through the OBDII port. As a result, only a few companies have developed programs for these new engines.

The stock AC Delco is actually a very good air filter. Google “spicer air filter study”. This study compares the performance of many popular air filters. Donaldson also makes good air filters.

I have used synthetic oil in all my vehicles for the last fifteen years. I have a 2008 Duramax LMM like yours. At the first oil change I put synthetic oil in it. Checking the oil one day, the dip stick indicated too much oil in the engine. That didn’t make sense. Did some research and learned that GM, Ford and Dodge are all plagued with this problem. When these motors go into the regeneration cycle to clean the DPF filter, a small amount of fuel is getting into the crankcase, which over time, is causing the oil level to rise. To solve the potential oil dilution problem, I now change my oil every 5,000 miles. For me, throwing synthetic oil out after only 5,000 miles was a waste. So I now use a dino oil, Shell Rotella T in my Duramax.

The 2011 Duramax LML, solves the oil dilution problem by not using the engine's injectors to spray fuel into the exhaust. Instead, a ninth fuel injector was added to the exhaust system to be used during regeneration.
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Old 07-06-2011, 03:19 PM   #76
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How Is It Done?

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Originally Posted by r carl View Post
I would recomend KILLING the DPF and getting a real HP TQ jump.
K&N type air filters pass more silica because of their bigger pores,
keep the stock air cleaner, its best for your use.
If you want to go to a high quality oil get dino LE or synthetic Amsoil as they are the best, period!
You can safely extend your drain intervals 3 times with those 2 oils.
How does one kill the DPF?
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Old 07-06-2011, 03:39 PM   #77
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How does one kill the DPF?
By removing the system. There are diesel guys in the diesel forums that know way more than me, they eat, sleep, and live diesels. You can go to one of the popular diesel forums and learn there what needs to be done. Personally if I had a 2008 I would remove the DPF and put on a free flowing cat back exhaust.
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Old 07-06-2011, 09:24 PM   #78
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By removing the system. There are diesel guys in the diesel forums that know way more than me, they eat, sleep, and live diesels. You can go to one of the popular diesel forums and learn there what needs to be done. Personally if I had a 2008 I would remove the DPF and put on a free flowing cat back exhaust.
Thanks, Rivet Master carl! I'll keep looking. The few dmax diesel forums i've been able to find all talk way over this newbies head. I long for a pro who would be willing to share the way this AS community does. I'm not a mechanic, so would need to hire the work done somewhere here in Central Virginia.
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Old 07-08-2011, 04:48 PM   #79
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Thanx for the info, John. After the Titan retrofit, you will be hovering at near 1,000 mile range. Please keep us posted on the tank install and results. mAre you doing the tank installation yourself or having it done?

Brian
Brian, got some pictures of the installed tank over here if your interested...
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Old 07-09-2011, 03:40 PM   #80
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We've also had the fuel filter changed with the oil changes. The wisdom of the internet says this is cheap insurance for expensive injectors, but I am not sure it is necessary as the DIC still shows lots of life. What are people's thoughts on this?

-DK

I agree, protecting the fuel system is important. My fuel filter gets changed about every ten thousand miles, which has been before the DIC indicates it needs to be changed. To help the fuel filter, I try to only fill up at stations that pump a lot of diesel, such as truck stops. I also keep a new fuel filter in the truck, just in case I get a load of bad fuel.
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Old 07-10-2011, 11:20 AM   #81
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We've also had the fuel filter changed with the oil changes. The wisdom of the internet says this is cheap insurance for expensive injectors, but I am not sure it is necessary as the DIC still shows lots of life. What are people's thoughts on this?

-DK
So, due to this thread, I asked my trusted service guy. He says when the DIC says about 20% left is soon enough for the fuel filter, assuming you always get clean fuel along the way.
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Old 07-10-2011, 12:13 PM   #82
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What always scared me with my Touareg TDI was that no where could I find WHEN to replace the fuel filters nor was there a "water" drain available....

Wondered - how,why,what...

Side note, the "water in fuel" light came on yesterday while driving down the coast, quick two minute drain while at McD's SteakHouse (McDonalds) and done....
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Old 07-13-2011, 03:14 PM   #83
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Brian, got some pictures of the installed tank over here if your interested...
I took a look at your photos. it looks great; nice job.

Brian
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Old 07-15-2011, 12:10 PM   #84
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It sounds like the new 2011 Duramax gets good MPG, but how much DEF does it use?

Dennis
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