Pick my next transfer case fluid drain and fill

[BobsArmory]

OK, I'm going to drain and fill the transfer case fluid on my 2023 GMC Sierra 1500 4x4 3.0 Duramax. It requires Dexron VI for the fluid. Pick a quality fluid. I don't care if it is a boutique brand or major company.

If it was your truck what would you put in it?

 

[6.7 CTD]

HPL or Amsoil

 

[#18FAN]

HPL or Amsoil

Next question.

 

[Rand]

probably redline since you need about 2 quarts?

HPL you have to order 6qt and shipping ouch

 

[#18FAN]

probably redline since you need about 2 quarts?

HPL you have to order 6qt and shipping ouch

You can order 1qt of hpl if you want to

 

[Rand]

You can order 1qt of hpl if you want to

do you have to call for 1 quart?

I just ordered gear oil but skipped transfer case oil because I didnt want 3 changes of it.

 

[#18FAN]

maybe it was gear oil I was thinking of. or do you have to call for 1 quart?

You can call for any product in the quantity you want.

 

[CleanSump]

At your local stores - Valvoline
If you are going to order - Amsoil, Redline, HPL

 

[ctechbob]

I replaced the transfer case fluid in my 25 F150 with MaxLife at 10k. Factory requirement was Mercon LV and I keep the Maxlife in the 20qt box for the Honda's, so in it went.

 

[GSCJR]

MaxLife

+1

 

[ClutchDisc]

Amsoil would be my choice.

 

[I<3oil]

At your local stores - Valvoline
If you are going to order - Amsoil, Redline, HPL

This

 

[Snagglefoot]

Easy. AC Delco.

 

[barkingspider]

What I have in my 2022 GMC transfer case now

This is what’s going in next OCI (already have 2 qts)

 

[Pablo]

Honestly I would go Dex lll rather than Dex Vl

 

[BobsArmory]

Honestly I would go Dex lll rather than Dex Vl

Why Dex 3? Is it because it's just a bit thicker?

 

[Pablo]

Why Dex 3? Is it because it's just a bit thicker?

It’s worth considering, yes. Suggest studying it a bit.

 

[burbguy82]

Beyond the expensive boutique oils as per normal suggestions......

Mobil Multi Vehicle meets the spec and is a bit thicker than typical Dex 6........and pretty cheap.

Tcases typically dont have a system that cools them, like an AT, and dont use pressures and solenoids valves to work.

I second @Pablo aswell.

 

[martinq]

I don't think most transfer case units are going to benefit from a 10-15% higher viscosity. Were talking about gears, chains, bearings and maybe a couple clutches? The add-pack and a quality base is what makes the difference.

I'd skip any Dexron spec and go higher like the new Valvoline Restore and Protect ATF or maybe Amsoil.

Valvoline has been making an impressive showing and it's not because of an expensive base oil, they seem to be leading the charge in anti-wear and cleaning.

 

[ditchdiggin]

I use Transynd TES 295