2020 Suburban RST

[bluebear15]

I just purchased a 2020 Suburban RST with the 6.2L engine and 10 speed transmission with 85K miles on it. I was just wondering what things I should be looking at maintenance wise to it. I am looking into the AFM delete but was wondering if there was anything else. I know the '21-'24 6.2L engines had the recall where they changed the oil weight but didn't know if I should look at anything for mine. Thanks for any insight.

 

[Tahoe14]

Owners manual would be a good place to start under maintenance. If you don’t have a hard copy there is one online. Also check the Carfax to see what maintenance has been performed.

 

[Joseph Garcia]

I would change all fluids first to establish your own fluids maintenance baseline. Examine each of the fluids upon removal, and send a used oil sample to Blackstone Labs for an assessment.

Do the electronic version of the AFM delete ASAP, and look into the cost and timing to get an AFM hardware delete in the future.

At that mileage, your shocks should be nearing the end of their useful lives, so you should check them for any signs of leakage.

Consider adding an oil catch can to your motor's oil system, since with your LT motor, the back sides of the intake valves are not being washed/cleaned with flowing gasoline.

 

[bluebear15]

Thanks! That's more of the type of information I was looking for. As far as oil do you stick with the factory recommended oil weight or increase it to a heavier weight? I know there's a big debate over regular oil and synthetic but for these engines specifically does it lend any benefits to go with synthetic?

 

[Loki223]

This is the AFM disabler i'm running, it was highly recommended when i bought it

https://www.amazon.com/dp/B0D1T1FMJK?ref_=ppx_hzsearch_conn_dt_b_fed_asin_title_4

As to oil, i prefer synthetic. No good reason to go the dino blend. As to oil type, with the 6.2 i'll defer to someone else. There are plenty of opinions on oil type with the AFM engines

 

[B-train]

Thanks! That's more of the type of information I was looking for. As far as oil do you stick with the factory recommended oil weight or increase it to a heavier weight? I know there's a big debate over regular oil and synthetic but for these engines specifically does it lend any benefits to go with synthetic?

Do yourself a favor and run 5w-30 full synthetic for best outcomes IMO. It's the recommended commercial oil in the 6.6L that isn't subject to CAFE gimmicks. I have the same motor and have run 5w-30 since it was new to me over 140k miles ago - doesn't burn a drop and never affected mpg in any way whatsoever.

These newer, direct injected, motors need a good quality oil - hence synthetic recommended from the factory. The amount of fuel dilution, carbon buildup with time, etc is common and can degrade oil quality much quicker than the old port injected motors.

But, the biggest contributor to longevity of any mechanical system (motor, trans, diffentials, t-case) is to keep the fluid CLEAN. Forget the stupid oil life monitor and keep it to the following:

1. LOF every 5k with good quality oil and filter
2. Transmission service every 40k
3. Diffentials and t-case every 40k
4. Other items as needed based on time/mileage.

 

[ReaperHWK]

I like to run a catch can in any DI motor for sure. Read up on it it’s up to you.

After I had to pull the intake and walnut blast the valves in my 2015 and seeing all the oil in there I run them on any vehicle I care about.

 

[Loki223]

I like to run a catch can in any DI motor for sure. Read up on it it’s up to you.

View attachment 479158



After I had to pull the intake and walnut blast the valves in my 2015 and seeing all the oil in there I run them on any vehicle I care about.

Interesting, i tried looking up the UPR kit you have, and it looks little different, but still something i might need to add to my burb

https://www.uprproducts.com/products/14-18-gm-chevrolet-gmc-truck-5-3l-6-2l-oil-catch-can-separator-plug-n-play?variant=46645933637809

 

[ReaperHWK]

Interesting, i tried looking up the UPR kit you have, and it looks little different, but still something i might need to add to my burb

https://www.uprproducts.com/products/14-18-gm-chevrolet-gmc-truck-5-3l-6-2l-oil-catch-can-separator-plug-n-play?variant=46645933637809

Yep that’s the one I had in my 2015 I installed after I cleaned out all the valves to keep them nice and clean. It worked well. It would fill up between oil changes.

I have a 2026 now is why the picture I posted looks different.

 

[bluebear15]

As far as AFM delete does anyone know if there is a difference in the red vs blue Range Technology RA003? Is it only to match the interior lighting with Chevy being blue and GMC being red? Or do they slightly differ for another reason

https://www.rangetechnology.com/products/afm-dfm_disabler/parts/RA003R