# 2020 GMC 2500 - Is 10-30 OK? **URL:** \ **Category:** Maintenance/Repairs\ **Tags:** gmc\ **Created:** [March 30, 2019, 4:40pm UTC](https://community.cartalk.com/t/2020-gmc-2500-is-10-30-ok/137557 "2019-03-30T16:40:04Z")\ **Posts on this page:** 18\ **Page:** 1
**Author:** ![Jim02](https://avatars.discourse-cdn.com/v4/letter/j/8c91f0/32.png) [@Jim02](https://community.cartalk.com/u/Jim02)\ **Post date:** [March 30, 2019, 4:40pm UTC](https://community.cartalk.com/t/2020-gmc-2500-is-10-30-ok/137557/1 "2019-03-30T16:40:04Z")
can I use 10-30 oil in my 6.2 liter diesel engine? I have always used straight 30 wt. but am finding it harder to obtain. ---
**Author:** ![Mustangman](https://sea1.discourse-cdn.com/cartalk/user_avatar/community.cartalk.com/mustangman/32/44130_2.png) [@Mustangman](https://community.cartalk.com/u/Mustangman)\ **Post date:** [March 30, 2019, 5:26pm UTC](https://community.cartalk.com/t/2020-gmc-2500-is-10-30-ok/137557/2 "2019-03-30T17:26:14Z")
What does GMC say should be in this engine? I am willing to bet GMC never specified straight 30 wt oil for this engine. My research say it should run 15W40 diesel spec oil ---
**Author:** ![Jim02](https://avatars.discourse-cdn.com/v4/letter/j/8c91f0/32.png) [@Jim02](https://community.cartalk.com/u/Jim02)\ **Post date:** [March 31, 2019, 9:56pm UTC](https://community.cartalk.com/t/2020-gmc-2500-is-10-30-ok/137557/3 "2019-03-31T21:56:14Z")
I guess you would lose that bet. They say sae 30 sf/cc or sf/cd. ---
**Author:** ![Jim02](https://avatars.discourse-cdn.com/v4/letter/j/8c91f0/32.png) [@Jim02](https://community.cartalk.com/u/Jim02)\ **Post date:** [March 31, 2019, 9:58pm UTC](https://community.cartalk.com/t/2020-gmc-2500-is-10-30-ok/137557/4 "2019-03-31T21:58:39Z")
I should have added that this is a 1982 GMC. ---
**Author:** ![VDCdriver](https://sea1.discourse-cdn.com/cartalk/user_avatar/community.cartalk.com/vdcdriver/32/48514_2.png) [@VDCdriver](https://community.cartalk.com/u/VDCdriver)\ **Post date:** [March 31, 2019, 9:59pm UTC](https://community.cartalk.com/t/2020-gmc-2500-is-10-30-ok/137557/5 "2019-03-31T21:59:00Z")
> [@Jim02](#): > > I guess you would lose that bet. They say sae 30 sf/cc or sf/cd. Then, why are you trying to second-guess the people who designed and manufactured your engine in **1982**? ---
**Author:** ![Jim02](https://avatars.discourse-cdn.com/v4/letter/j/8c91f0/32.png) [@Jim02](https://community.cartalk.com/u/Jim02)\ **Post date:** [March 31, 2019, 10:04pm UTC](https://community.cartalk.com/t/2020-gmc-2500-is-10-30-ok/137557/6 "2019-03-31T22:04:56Z")
I would think that the oil performance has improved in 27 years and remember the Car Talk guys mentioned something about that. ---
**Author:** ![Mustangman](https://sea1.discourse-cdn.com/cartalk/user_avatar/community.cartalk.com/mustangman/32/44130_2.png) [@Mustangman](https://community.cartalk.com/u/Mustangman)\ **Post date:** [March 31, 2019, 10:29pm UTC](https://community.cartalk.com/t/2020-gmc-2500-is-10-30-ok/137557/7 "2019-03-31T22:29:17Z")
Yes, you should have added that if you want accurate answers. Your post says 2020 GMC. ---
**Author:** ![Jim02](https://avatars.discourse-cdn.com/v4/letter/j/8c91f0/32.png) [@Jim02](https://community.cartalk.com/u/Jim02)\ **Post date:** [April 1, 2019, 1:15am UTC](https://community.cartalk.com/t/2020-gmc-2500-is-10-30-ok/137557/8 "2019-04-01T01:15:13Z")
Sorry to upset you about this. Didn’t seem like that big of a deal. I didn’t list my vehicle as 2020. ---
**Author:** ![Barkydog](https://sea1.discourse-cdn.com/cartalk/user_avatar/community.cartalk.com/barkydog/32/2470_2.png) [@Barkydog](https://community.cartalk.com/u/Barkydog)\ **Post date:** [April 1, 2019, 1:17am UTC](https://community.cartalk.com/t/2020-gmc-2500-is-10-30-ok/137557/9 "2019-04-01T01:17:53Z")
The tile shows up as 2020 GMC 2500. ---
**Author:** ![db4690](https://sea1.discourse-cdn.com/cartalk/user_avatar/community.cartalk.com/db4690/32/2583_2.png) [@db4690](https://community.cartalk.com/u/db4690)\ **Post date:** [April 1, 2019, 1:33am UTC](https://community.cartalk.com/t/2020-gmc-2500-is-10-30-ok/137557/10 "2019-04-01T01:33:52Z")
“2020 GMC 2500 - Is 10-30 OK?” I just quoted the title of the post So . . . yes, you did list your vehicle as a model year 2020 GMC ---
**Author:** ![Jim02](https://avatars.discourse-cdn.com/v4/letter/j/8c91f0/32.png) [@Jim02](https://community.cartalk.com/u/Jim02)\ **Post date:** [April 1, 2019, 2:04am UTC](https://community.cartalk.com/t/2020-gmc-2500-is-10-30-ok/137557/11 "2019-04-01T02:04:25Z")
O.K. Let’s start over. My truck is a 1982 GMC Sierra C2500 3/4 ton pickup with a 6.2 Diesel engine. Does anyone know of 10/30 diesel rated oil is appropriate? ---
**Author:** ![Scrapyard-John](https://avatars.discourse-cdn.com/v4/letter/s/f6c823/32.png) [@Scrapyard-John](https://community.cartalk.com/u/Scrapyard-John)\ **Post date:** [April 1, 2019, 2:59am UTC](https://community.cartalk.com/t/2020-gmc-2500-is-10-30-ok/137557/12 "2019-04-01T02:59:26Z")
Should be fine, considering the only difference from the 30 weight that’s recommended is the 10w30 flows better when cold. 15w40 would be my choice if you’re in a warm climate. ---
**Author:** ![VOLVO-V70](https://avatars.discourse-cdn.com/v4/letter/v/8e8cbc/32.png) [@VOLVO-V70](https://community.cartalk.com/u/VOLVO-V70)\ **Post date:** [April 1, 2019, 3:14am UTC](https://community.cartalk.com/t/2020-gmc-2500-is-10-30-ok/137557/13 "2019-04-01T03:14:35Z")
Frankly if it was my 1982 diesel I would just use a brand name oils for diesels and be done with it . I might call a dealer parts department , contact Rotella or go by a diesel truck repair place. ---
**Author:** ![db4690](https://sea1.discourse-cdn.com/cartalk/user_avatar/community.cartalk.com/db4690/32/2583_2.png) [@db4690](https://community.cartalk.com/u/db4690)\ **Post date:** [April 1, 2019, 3:17am UTC](https://community.cartalk.com/t/2020-gmc-2500-is-10-30-ok/137557/14 "2019-04-01T03:17:47Z")
I would buy 15w40, when it’s on sale next time at Costco ---
**Author:** ![Jim02](https://avatars.discourse-cdn.com/v4/letter/j/8c91f0/32.png) [@Jim02](https://community.cartalk.com/u/Jim02)\ **Post date:** [April 1, 2019, 3:19am UTC](https://community.cartalk.com/t/2020-gmc-2500-is-10-30-ok/137557/15 "2019-04-01T03:19:43Z")
Thanks John. I live in Northern California so temp shouldn’t be an issue. ---
**Author:** ![Nevada\_545](https://sea1.discourse-cdn.com/cartalk/user_avatar/community.cartalk.com/nevada_545/32/41232_2.png) [@Nevada\_545](https://community.cartalk.com/u/Nevada_545)\ **Post date:** [April 1, 2019, 3:26am UTC](https://community.cartalk.com/t/2020-gmc-2500-is-10-30-ok/137557/16 "2019-04-01T03:26:49Z")
I don’t have information for 1982 but for the 1985 6.2 L diesel engine 10W30 is the only oil listed. I would use modern 15W40 oil made for diesel engines, the common 10W30 found today oil will not have the amount of zinc necessary for flat tappet engines unless it is diesel specific motor oil. ---
**Author:** ![Mustangman](https://sea1.discourse-cdn.com/cartalk/user_avatar/community.cartalk.com/mustangman/32/44130_2.png) [@Mustangman](https://community.cartalk.com/u/Mustangman)\ **Post date:** [April 1, 2019, 11:56am UTC](https://community.cartalk.com/t/2020-gmc-2500-is-10-30-ok/137557/17 "2019-04-01T11:56:08Z")
No need to apologize to me. You were looking for advice and didn’t supply the information so you got the best info I could give based on that. My advice stands, 15W40 diesel spec oil. ---
**Author:** ![lion9car](https://avatars.discourse-cdn.com/v4/letter/l/59ef9b/32.png) [@lion9car](https://community.cartalk.com/u/lion9car)\ **Post date:** [April 1, 2019, 1:38pm UTC](https://community.cartalk.com/t/2020-gmc-2500-is-10-30-ok/137557/18 "2019-04-01T13:38:10Z")
I see Rotella and Delo on Amazon for what I think is a reasonable price. I also see that our local tractor and farm supply store carries Rotella, so check one of those stores if you have one nearby and if you didn’t think of that already.