Oil recommendations - Page 2 - Chevy and GMC Duramax Diesel Forum
01-04.5 LB7 Duramax Powertrain Discussion of components that are directly involved in the power production and all that is needed to get and keep the truck moving . Engine , Transmission, Etc.

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post #11 of 21 (permalink) Old 12-11-2019, 03:51 PM
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Iíve been happy with Rotella T5 15-40. If you can get T6 for just a bit more, go ahead. I change oil often enough (due to lots of dusty/dirty conditions, amount of start/stop cycles, etc.) that I go with T5, as T6 is always more $$$ out here

Hope this helps.
Ely

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post #12 of 21 (permalink) Old 12-11-2019, 04:06 PM
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T6 the cost difference especially if you shop around for sales is not much when your servicing a $50K piece of equipment.

But the T5 and T4 are quality products. none of them would hurt my feelings using regularly

my .02 good luck

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post #13 of 21 (permalink) Old 12-11-2019, 05:15 PM
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Originally Posted by Jaf2021 View Post
Any advantages going to a synthetic oil? Reading about it says improved power better fuel mileage? Is it safe going from Rotella 15w40 conventional oil to synthetic??

There is very little different in terms of performance. The synthetic lasts a little longer, but realistically unless your removing soot from the oil, your change interval will be before either oil package is depleted. Synthetic has better cold start characteristics so in cold climates its more free flowing. Thats about it. Its safe to go from one to the other back to the first and so on if you like. Some people run synthetic in the winter and conventional in the summer. Basically run whatever makes you happy. For me, thats dino oil every 4K ish.

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post #14 of 21 (permalink) Old 12-11-2019, 06:40 PM
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There is very little different in terms of performance. The synthetic lasts a little longer, but realistically unless your removing soot from the oil, your change interval will be before either oil package is depleted. Synthetic has better cold start characteristics so in cold climates its more free flowing. Thats about it. Its safe to go from one to the other back to the first and so on if you like. Some people run synthetic in the winter and conventional in the summer. Basically run whatever makes you happy. For me, thats dino oil every 4K ish.
Agree and like Bob said, if you're going to go twice as long (15k-20k) between changes, go synthetic. After all the research I did before making my decision, I decided to go with regular 15w-40 and change it every 5k or so. Filtration is just as or maybe more important than the oil you use. Use good efficiency filters and change them and the oil often!

Good Luck in your decision!

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post #15 of 21 (permalink) Old 12-12-2019, 06:39 AM
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I am going to start off by saying i am not an oil expert. I run Amsoil 5W-40 and have been in my duramax since about 1000 miles. The main reason i went to full synthetic is to get the 5W-40 rating as i live in a climate where one day it could be 30 above and the next it could be -10 and I only put enough miles on my pickup to change oil once per year. The ability to have an oil that allows for better cold starts is why i went the synthetic route. I did do an experiment last year and put Amsoil 15W-40 in just to see if i could tell a noticeable difference in cold starts as well as to see if these two maintained similar oil pressure at operating temp. I did find there was a pretty considerable difference in the cranking speed but the pressure at operating temp was the same, as to be expected.

I guess IMO if you live in a climate where you have both cold and hot extremes i prefer to run a synthetic for the 5W-40 rating, or if you want to extend you oil service intervals go synthetic.
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post #16 of 21 (permalink) Old 12-12-2019, 08:16 AM
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Originally Posted by 6.5 Diesel View Post
I am going to start off by saying i am not an oil expert. I run Amsoil 5W-40 and have been in my duramax since about 1000 miles. The main reason i went to full synthetic is to get the 5W-40 rating as i live in a climate where one day it could be 30 above and the next it could be -10 and I only put enough miles on my pickup to change oil once per year. The ability to have an oil that allows for better cold starts is why i went the synthetic route. I did do an experiment last year and put Amsoil 15W-40 in just to see if i could tell a noticeable difference in cold starts as well as to see if these two maintained similar oil pressure at operating temp. I did find there was a pretty considerable difference in the cranking speed but the pressure at operating temp was the same, as to be expected.

I guess IMO if you live in a climate where you have both cold and hot extremes i prefer to run a synthetic for the 5W-40 rating, or if you want to extend you oil service intervals go synthetic.
I just switched to 15w-40 Amsoil AME in my powerstroke and will be switching the Duramax on its next change. I noticed the powerstroke ran much more quiet with the Amsoil.

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post #17 of 21 (permalink) Old 12-12-2019, 08:16 AM
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$120 for 4 Gallons is $30 a gallon, not a bad price

Rebate brings it down to $20.25 a gallon

Unbeatable.......
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post #18 of 21 (permalink) Old 12-12-2019, 08:30 AM
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https://www.cenex.com/about/cenex-in...gine-oil-myths

Read myth #3 and educate yourself. D
Great info, thanks for the link!

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post #19 of 21 (permalink) Old 12-12-2019, 03:54 PM
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Simply put, if you use synthetic, then stick to their recommended oil change intervals. Otherwise, you are wasting money if you change your oil sooner as with the recommendations of conventional oil. Synthetics give you the ability to extend oil change time frames. Both conventional and synthetic oils today provide good protection. One simply can go longer oil change intervals.

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post #20 of 21 (permalink) Old 12-12-2019, 05:56 PM
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Tests clearly show synthetic oil to be far superior to mineral based. One big advantage is that you can get 5w-40 syn oil and only 15w-40 mineral so in cold weather and cold starts you will see a big difference. Oils are not developed by oil companies, but by speciality companies that sell additive packages to Shell for mfg of their oil. I was visiting the largest of these several years back and they have extensive dyno cells, chem labs, etc and do a lot of back to back testing. So I asked which is the best diesel oil, he went and asked one of the gurus and Shell Rotella was the answer by far. I may be dumb but not stupid I just use Rotella T6 5w-40 now.
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