Rear diff fluid

[Tiredmechanic23]

I am about to be doing a rear diff fluid. Rather than GM fluid what other fluids does anyone recommend? I do have the G80 option. Last change was done at the dealer before my free services ended and I rather use something better if available since ill be paying now.

 

[wjburken]

I would go with what your owners manual recommends.

@Jolly Roger and @Rocket Man just did their own PhD dissertations on this topic.

 

[mbp1979]

I used royal purple in mine. I use there fuilds everywhere I can ive always had great results.

 

[Tiredmechanic23]

I would go with what your owners manual recommends.

@Jolly Roger and @Rocket Man just did their own PhD dissertations on this topic.

View attachment 254589

I get that I just want opinions on non GM fluids. GM fluids are not always the best.

 

[BlackYukon]

I get that I just want opinions on non GM fluids. GM fluids are not always the best.

If you want the highest quality it's going to be Amsoil.

 

[Tahoe14]

Its like asking what is the best oil. You will get many recommendations and be more confused than when you started.

 

[mbp1979]

Its like asking what is the best oil. You will get many recommendations and be more confused than when you started.

Isn't that the truth!!!

Sent from my SM-N960U using Tapatalk

 

[Tiredmechanic23]

Its like asking what is the best oil. You will get many recommendations and be more confused than when you started.

for some that may be. I take suggestions and research from there. Ive always gone about things that way. Take suggestions and further research from there.

Big question I have now as things have changed since my last GM truck/SUV. Do the G80 on the K2 platform require LSD additives or no?

 

[Tahoe14]

As an example I belong to another very good truck forum. There was a discussion about rear diff fluid. So far it is seven pages long with about 100 posts. Everyone has an opinion. Seven fluids were recommended, GM, Mobil 1, Mobil 1 Delvac, Amsoil, Triton, Redline, Carquest brand produced by Old World Industries and I am sure there are many more. This should give you a starting point so you can do your research. If you want to carry it one step further pick several to try and then have them analyzed after some mileage by one of the companies that specializes in this process. Good luck with your final selection.

 

[wjburken]

Do the G80 on the K2 platform require LSD additives or no?

If I’m not mistaken, the G80’s do not need the friction modifier additive.

@Rocket Man or @Jolly Roger, either of you want to share what you learned about additives on the G80 differentials since you both went down the rabbit hole on this one recently?