Synthetic Oil?

[Ed HD]

Does the GM FSM say that the warrranty is expired if you don't run Synthetic Oil? Also, we are having the tranny fluid at 47,000 miles, is that recommended? I know it is supposed to run 100k, but with the abuse this truck has seen, it is better safe than sorry. It is also getting a new fuel filter, it is over 1400 Hrs, so it needs it. What other things on a 4x4 should we have looked at?

 

[Wrecker]

I'm not sure I understand your question, synthetic or dino will not void your warranty.
It is illegal for the manufacturer to do so.

The front and rear differentials should also be serviced if they haven't been and you are at 47k miles, and also changing the transfer case fluid is not a bad idea, it's only 2 qts of fluid. I hope this helps. Please clarify your question if I didn't answer it.

 

[Randy_the_Hack]

Also... take a moment and fill out your sig - it just takes a minute and helps us all see what model you have, what mods you've done, etc... which can make a big difference in the advice you receive.

 

[Ed HD]

We were told that it would void the warranty if you didn't run synthetic. We run it anyways, but that is what we were told, by our local service place. We already have the service scheduled, but next time we will, or otherwise we can do it ourselves, we have a lift at home, but we need the headlights fixed, and we can't do that ourselves.

 

[Ed HD]

PS: I did fill out my sig, I'm on a few other forums, so I'm not a complete newb

 

[Ragindiesel]

per the magnuson moss act they cannot deny your warranty for using synthetic oil. Please make sure it is endorsed on the back for your application.

Amsoil does have GM certs on the back label

 

[Ed HD]

We run Mobil Delvac Synthetic.

 

[Ragindiesel]

As long as GM certs are on the bottle they cannot deny your warranty work without proof that the oil caused said problem. Mobil makes a great product and has been around the industry long enough to cover there backside and not produce a product that can't be used in the vast amount of light duty diesels on the road today.

 

[Bammer]

As long as GM certs are on the bottle they cannot deny your warranty work without proof that the oil caused said problem. Mobil makes a great product and has been around the industry long enough to cover there backside and not produce a product that can't be used in the vast amount of light duty diesels on the road today.

Exactly, GM has to prove that the oil was the cause of the failure,and they will in no way know what oil brand was in there without some serious testing and then they still might not know for sure.