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Chevy Silverado and GMC Sierra Duramax Fuel Mileage

506 messages,  Last post on Nov 30, 2009 at 5:21 PM

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What is this discussion about? Chevrolet Silverado 2500HD, Chevrolet Silverado 3500, GMC Sierra 2500HD, GMC Sierra 3500, Diesel, Fuel Efficiency (MPG), Truck

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#439 of 506 Re: Duramax Milage [jbull454GMC] by losman54 Jan 25, 2009 (6:47 pm)
Replying to: jbull454GMC (Jan 25, 2009 6:38 pm) I will have to check but I suspect that you are not going to be able to run synthetic oil in a diesel. I'm open to comments Replies to this message: jbull454GMC (Jan 25, 2009 7:00 pm) losman54 (Jan 25, 2009 7:12 pm) jbull454GMC (Jan 25, 2009 7:23 pm)
#440 of 506 Re: Duramax Milage [losman54] by jbull454GMC Jan 25, 2009 (7:00 pm)
Replying to: losman54 (Jan 25, 2009 6:47 pm) I'm going to do more research as well. I still plan on giving it a try. Right now I use Rotella. Everything I've heard and read its the best conventional oil on the market for a diesel. I would like to know if anyone else has any insight on synthetic oils in a duramax too. Let us know folks! Replies to this message: losman54 (Jan 25, 2009 7:12 pm) jbull454GMC (Jan 25, 2009 7:23 pm)
#441 of 506 Re: Duramax Milage [jbull454GMC] by losman54 Jan 25, 2009 (7:12 pm)
Replying to: jbull454GMC (Jan 25, 2009 7:00 pm) I just did a quick Google search and I was pleasantly surprised to see the following: http://www.oilsandlube.com/dieseloil21.htm Based on what this says...I'm willing to give it try after I ask to see if it would void any warranties. Replies to this message: jbull454GMC (Jan 25, 2009 7:23 pm)
#442 of 506 by losman54 Jan 25, 2009 (7:20 pm)
You know I must of just taken a stupid pill! I just remembered that my wife's Jetta diesel gets synthetic oil every 10K miles,,,btw...we get 48-50 MPG
#443 of 506 Re: Duramax Milage [losman54] by jbull454GMC Jan 25, 2009 (7:23 pm)
Replying to: losman54 (Jan 25, 2009 7:12 pm) That is an interesting site. Being an Amsoil preferred customer I do get literature on their tests. The wear tests are very impressive. They also have several fuel additives for diesels too. If you look further in to Amsoil look at becoming a preferred customer also. It will save you a lot in the long run. Especially if you start using it other vehicles. I was changing oil on 8 for a while. Conventional oil was costing me on that. I switched to Amsoil and their extended service oils...I saved $700.00 in oil changes alone. Plus the fuel mileage increases, but as I said before it was on gas engines. After looking at what that site says about rotella I might use a different conventional oil too.
#444 of 506 synthetic oil is said to improve MPG by losman54 Jan 25, 2009 (7:27 pm)
http://www.performanceoiltechnology.com/DuramaxDiesel.htm        "Chevrolet Duramax Diesel Owners   Learn about AMSOIL synthetic motor oil from experienced Diesel Truck Engineers and Lubrication Specialists right here in the auto and truck engineering and manufacturing capital of the world- Detroit, Michigan.   We are diesel engine, powertrain and chassis experts and are here to help you achieve optimum performance and longevity from your truck.   You've spent your hard earned money on the Duramax Diesel option in one of the most popular and well engineered trucks there is, now don't you think you owe it to yourself to use the very best oil in it? And don't let your local dealership service center tell you that you you have to use their brand of oil to "maintain your warranty". That is a false statement by the dealership, yet it goes on day in and day out. We constantly receive calls from customers that were told this by their servicing dealership. This practice is not authorized or condoned by the auto manufacturers, but the fact is it still goes on.   How a servicing dealership can essentially tell a customer that they have to use a lower quality oil than AMSOIL to "maintain their warranty" is not only wrong but it is also illegal unless they provide it free of charge. There are Federal laws that protect you against this. Please read our Warranty Laws You Need to Know section of this website to learn more or send us an email.   Take a look at the varnish deposits in this picture below. These are the results of a severe high temperature deposit test. The one at the far right is AMSOIL Synthetic 15W-40 Diesel oil and the others are major brand petroleum diesel oils. (left to right: Chevron Delo 400, Cummins Premium Blue, Shell Rotella T, AMSOIL 15W-40). The test clearly shows that AMSOIL keeps engines cleaner longer than other major brand diesel oils do. Which oil would you rather have protecting your engine?" Replies to this message: jbull454GMC (Jan 25, 2009 7:34 pm)
#445 of 506 Re: synthetic oil is said to improve MPG [losman54] by jbull454GMC Jan 25, 2009 (7:34 pm)
Replying to: losman54 (Jan 25, 2009 7:27 pm) That is even more interesting. I need to dig deeper in to their web site. I'm a customer, I should! lol I know if you plan on keeping your vehicle for any extended time their bypass filters are a wise investment also.
#446 of 506 Re: considering chevy [jbull454GMC] by madbrit427 Jan 26, 2009 (12:23 am)
Replying to: jbull454GMC (Jan 25, 2009 5:29 pm) I have a 2004 model and am starting to get injector problems, so I am interested in that recall that "jbull454GMC" is refering to. They have replaced one under warranty but the truck still smells of unburnt diesel fuel. The engine surges when driven under 1500rpm too. Apparently the extended warranty company (GM) will not pay to replace all the injectors which the dealership wanted to do.   Plenty of power, always did even with the first really bad injector. A few other niggling complaints of sticky steering when first started and turning out of a parking space and that damn rattle from the steering shaft even after they replaced it.
#447 of 506 by losman54 Jan 26, 2009 (6:56 am)
I dont know if this helps but, I had a 2002 and I got a letter from GM extending the injectors out another 100K ...a total of 200K...maybe tat was just for that truck year of 2002. Replies to this message: jbull454GMC (Jan 26, 2009 10:21 am)
#448 of 506 Re: [losman54] by jbull454GMC Jan 26, 2009 (10:21 am)
Replying to: losman54 (Jan 26, 2009 6:56 am) They have extended the warranty on the injectors. You will need to get with your dealership on that. If there is a hassle I would concider calling either Chevrolet or GMC customer assistance depending on what you have.

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