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Maintenance & Fluids Discuss products, techniques, intervals, and fluids for maintaining your GM truck including oil and oil additives, fuel and fuel additives, alternative fuels (Bio-D, SVO, WVO), filters, grease, and maintenance specific tools. is the premier Duramax Diesel Forum on the internet. Registered Users do not see the above ads.
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Old 03-19-2006, 10:46 AM   #1 (permalink)
Gear Grinder
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Shell Rotella 5W-40 Synthetic

Does anyone run Shell Rotella 5W-40 Synthetic bend oil in their Duramax? I've been using Shell Rotella 15W-40 in my diesel pickups for years and have had good luck.

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Old 03-19-2006, 11:26 AM   #2 (permalink)
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It is not a synthetic blend. It is a group III oil that the US courts have ruled can be described as "synthetic".

Lots of people on this site use it and like it.

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Old 03-19-2006, 11:40 AM   #3 (permalink)
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On my 2nd oil change last week, I started using Shell Rotella 15W40. The higher priced synthetic (5W40) is not worth it unless you live in an extremely cold climate. (The "5" in the viscosity rating indicates better flow at cold temperatures.)

While synthetic oil has slightly better lubricating properties at higher temperatures, I do not see reasonable justification paying the higher price, since the reason to change any oil is because it gets dirty. Synthetic oil gets dirty just like regular dino oil. JMO.
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Old 03-19-2006, 12:06 PM   #4 (permalink)
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I've used a lot of both flavors of Rotella in my truck with excellent results. I've also gotten great service out of Mobil Delvac Super 1300 15W40. I've usually swapped between 15W40 and 5W40 synthetics seasonally for cold start and cold weather flow. But I've also run the synthetic from -10* Wisconsin to 90* towing in southern Florida and back with no problems. It's a matter of choice, but I usually run more synthetic than dino - I don't mind the few extra dollars for more protection on 7500 to 9000 mile changeouts.
Tom Ashley 04 2500HD 6.0-4x4 CCSB- DMax and HHR are gone and I've gone gasser.
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Old 03-19-2006, 01:06 PM   #5 (permalink)
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I dont know, changed over to Rotella syn at about 10000miles. Seemed to run slightly quieter.Anyhow I have 50000miles with some 9000lb trailer towing, I'm staying with what seems to work for me. IMO syn oil IS worth the extra $.
04-2500HD CC SB 2wd westen step ups( Im old ) Leer tonneau cover. Banks 4" exhaust, Transfer flow in the bed tank 50gal.Going to do some long traveling. Rancho 9000 shocks. Love this truck, Building 55 Ford pick-up as new toy.
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Old 03-20-2006, 02:20 PM   #6 (permalink)
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I just changed my oil from a facotry oil change of Delo and i can hear a little difference at idle( its just barely a noticeable change). It was only 4 dollars a gallon more at my local walmart over the 15w40. It may have been on sale i dont remeber though. so so i spent about 12 dollars more for the synthetic. Thats worth it in my book if it provides better lubrication. Oh and I have never liked Delo.
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Old 03-20-2006, 07:47 PM   #7 (permalink)
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I had run Rotella Syn 5W40 since 2nd oil change at 4300 mi, and again at 8000 mi. The truck seemed quieter especially in the morning on a cold start. My MPG went up approximately 0.8 to 1 after switching as well. This could also be just a coincidence.
When I get the truck back from the dealer (long story), I'm probably going to use Mobil Delvac 1300 Super 15W40 since I usually change it every 3-4k. Since that's what comes in the Dmax from the factory, it's easy to obtain anywhere ($7.23 at wally world)= works for me.
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Old 03-20-2006, 08:05 PM   #8 (permalink)
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I've heard that 5w40 will improve mileage some over 15w40. I can see that if it is thinner but does it protect as well? What about Amsoil. Any comments?
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Old 03-20-2006, 08:14 PM   #9 (permalink)
John DiMartino
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Synthetic offers more shut down protection with turbo diesels,this is esp important with modded trucks,twins turbos,and big showerheads,where cooling to 300 degrees can take 5 minutes + in the summer.Running the mobil 5w40 synthetic Delvac 1,it can shutdown at 400 dgrees now.Cold starts are much improved,as well. I say go for the synthetic.
2004 Chev 2500HD CC4x4,LB7/Allison,.2001 GMC 2500HD SLT CC SWB 4x4,8100 allison,3.73
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Old 03-20-2006, 11:09 PM   #10 (permalink)
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Used Rotella Syn for first couple of oil changes until Mobil 1 Truck & SUV came out. Prefer Mobil 1 since I've used it since about 1978 in every vehicle I've had since then. Since I'm no longer living in Alaska, I am less concerned about the low temp starting benefit of syn but am more concerned with the high temp stability of syn oil. Dirty syn is still better than dirty dino; buy and use what you like.

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