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Car Forum / GMC Cars / October 2005What oil in '05 Chevy Turbodiesel
Is there anything wrong with putting 10W30 into the turbo diesel engine in an '05 chevy pickup? The manual calls for 15W40 but I was told that for temperature below 32 F, 10W30 can be used. We live in the midwest and it will likely go well into the cold Iowa winter before it is due for changing again. > Is there anything wrong with putting 10W30 into the turbo diesel engine > in an '05 chevy pickup? > The manual calls for 15W40 but I was told that for temperature below 32 > F, 10W30 can be used. We live in the midwest and it will likely go well > into the cold Iowa winter before it is due for changing again. Use what the manual recommends. Especially if you want to keep your warranty in force. Dave >Is there anything wrong with putting 10W30 into the turbo diesel engine >in an '05 chevy pickup? >The manual calls for 15W40 but I was told that for temperature below 32 >F, 10W30 can be used. We live in the midwest and it will likely go well >into the cold Iowa winter before it is due for changing again. ============ DO NOT USE AUTOMOBILE MOTOR OIL. YOUR TRUCK CALLS FOR DIESEL RATED MOTOR OIL, CI-4. ALMOST NO AUTOMOTIVE OILS ARE RATED CI-4. THE DIESEL RATING IS NEEDED TO DEAL WITH COMBUSTION BY-PRODUCTS UNIQUE TO DIESEL ENGINES. Your truck calls for 15w-40 oil, with a CI-4 rating. The alternative is 5w-40 with a CI-4 rating, which appears to be what you are looking for. The 5w-40 can be used year round as most are synthetics, and is better for cold weather starts. These oils should be available at stores such as WalMart. Brands to look for , 15w-40, include Shell Rotella, Mobil Delvac 1300, Chevron Delo 400, etc. Just look for the CI-4 rating. Most 15w-40 oils have it, as this viscosity range is for diesels. In 5w-40, you can look for Shell Rotella Synthetic, and Mobil 1 Truck and SUV. My local WalMart carries both. The Rotella Synthetic comes in gallon jugs, the Truck and SUV in 5 quart jugs. The 5 quart jugs are especially convenient, as two jugs is the engine capacity. > DO NOT USE AUTOMOBILE MOTOR OIL. YOUR TRUCK CALLS FOR DIESEL RATED > MOTOR OIL, CI-4. ALMOST NO AUTOMOTIVE OILS ARE RATED CI-4. THE > DIESEL RATING IS NEEDED TO DEAL WITH COMBUSTION BY-PRODUCTS UNIQUE TO > DIESEL ENGINES. Not true, there are a lot of the better oils that are diesel rated too but I do not think you will find any 5w30 diesel rated but there is a lot of 10w30 that is and a few grades of Mobile one is diesel rated as well. Oil burners generally take 15w40 but can use a few other grades too. ----------------- www.thesnoman.com >> DO NOT USE AUTOMOBILE MOTOR OIL. YOUR TRUCK CALLS FOR DIESEL RATED >> MOTOR OIL, CI-4. ALMOST NO AUTOMOTIVE OILS ARE RATED CI-4. THE [quoted text clipped - 5 lines] >lot of 10w30 that is and a few grades of Mobile one is diesel rated as >well. Oil burners generally take 15w40 but can use a few other grades too. ============== Please provide the name of one specific 10w-30 oil that is generally available in the USA and sold to the general public for automobiles that has a CI-4 rating as is required by an EGR equipped diesel such as the GM Duramax. GM specifies CI-4 rated oil for the Duramax.. The oils you are thinking about, if you check their specs, only go up to CF, or, at most, CG. So they may be "diesel rated" but the diesel rating is not high enough to meet the GM requirement for a Duramax. And you did not read my post carefully. I said "ALMOST NO AUTOMOTIVE OILS ARE RATED CI-4". I provided for the possibility that there may be one that I am unfamiliar with. However, the original poster was talking about 10w-30 oils generically. If you go into any well equipped automotive store, and pick the 10w-30 oils at random, I stick by my statement that almost none of them are rated CI-4. Greetings, According to my Duramax owner's manual, 15w-40 and 10w-30 are both rated for the same low temperature range (0F) but 10w-30 tops out at 100F. For temps lower than 0F, the book says to use 5w-40 and if I were in your shoes then that's the oil I'd use. The '04s call for either CI-4 or CH-4, but the '05s MAY only require CI-4. My personal preference would be to stick with a synthetic, and use the 5w-40 from around November to April. Cheers - Jonathan > Is there anything wrong with putting 10W30 into the turbo diesel engine > in an '05 chevy pickup? > The manual calls for 15W40 but I was told that for temperature below 32 > F, 10W30 can be used. We live in the midwest and it will likely go well > into the cold Iowa winter before it is due for changing again. >Greetings, > [quoted text clipped - 8 lines] > >Cheers - Jonathan ============= I have an 03 Duramax with the LB7 engine. This engine does not have EGR, and the manual calls for CH-4 or CI-4. I am not sure what is in the manual for the 05 either, but the 05 uses the LLY engine that has EGR. The difference between CH-4 and CI-4 is that the CI-4 certification test includes parameters specifically relevant to EGR engines. So I would use CI-4 for an 05 EGR equipped engine, even if the owner's manual still said CH-4 or CI-4. Actually, at this time, all of the "real" diesel motor oils, such as Rotella, Delvac, Mobil 1 Truck and SUV, Chevron Delo, etc. have the CI-4 rating, and some even have a CI-4+ rating. What would be the consequences of using a 10W30 oil that didn't meet the specs for that particular engine? > What would be the consequences of using a 10W30 oil that didn't meet >the specs for that particular engine? ========= The principal thing in the CI-4 rating is the capability to keep soot in suspension, which is important for diesels, particularly the EGR diesels, but not relevant to gasoline engines. If the soot gets out of suspension, it can coke up/sludge up an engine. The other thing you see in the specification is the Total Base Number, or "TBN" of the CI-4 oils is much higher than the TBN of automobile oils that may have a CF rating. Total base numbers of the top of the line diesel CI-4 oils is around 12, and for the really, really top oils used for super heavy duty construction equipment, I have seen as high as around 14. On the other hand, for gasoline engine oils that otherwise meet SL, it is usually under 10. This represents the ability of the oil to handle acid combustion bproducts. Greetings, Let me add my two cents worth here as well concerning the ability of an oil to suspend soot. Since the Duramax has a turbocharger, this ability is crucial to the bearings in the turbo because excess carbon (which is what soot is) can cause accelerated wear. Carbon deposits, also known as coke, form quickly on the superheated bearing surfaces in the turbo with lesser quality oils because they tend to break down under the heat, an issue of concern for these bearings after a hot shut down when no oil is flowing to cool them down or during periods of high load (like towing) when exhaust gas temps can rise dramatically. This is one of the primary reasons (resistance to thermal breakdown and ability to maintain soot in suspension) why I use a high quality full synthetic motor oil in my Duramax. Using a 10w-30 motor oil that is not CI-4 or CH-4 rated increases the risk of failure to what is otherwise a very expensive part. And to repeat what I said before, both 10w-30 and 15w-40 motor oils are only rated down to 0 degrees F. If you are looking for a cold weather oil for your Duramax, then go with what the book recommends - 5w-40. You will realize no benefit from 10w-30 in cold weather and just might be jeopardizing your motor if the oil doesn't meet the necessary specs. Cheers - Jonathan >> What would be the consequences of using a 10W30 oil that didn't meet >>the specs for that particular engine? [quoted text clipped - 17 lines] > This represents the ability of the oil to handle acid combustion > bproducts. |
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