The GM part number should be on a plastic tag attached to the fill hole plug. Both the Mopar and GM numbers were given on the *Important* warning tag.<br><br>Personally I just filled it up with Amsoil Series 2000 80W-90 and didn't give it another thought. I can get that locally for $8/quart. Seems to work well and many others have reported some high miles on it in a 5speed.

 

Is anyone using thr Royal Purple in the 4500? If so how long and what results.

 

Come on guys!<br><br>You know those Mopar stickers are expensive. : They sell these trucks at such a low price they gotta make money somewhere. <br><br>By the way my dealer still doesn't have my tranny fluid in I paid for. &gt; The SOB said it would be here tomorrow on the next truck, come to find out in a talk with his boss the truck doesn't come till Wednesday and the edit forgot to order the stuff. &gt; So much for good service at that dealer. [undecided]<br><br>DB

 

Alright DB, I'll cut your price to $118.95 and I'll pay shipping. ;D ;D

 

Such a generous man. [undecided] <br><br>DB

 

If you felt something hit you in the back as you walked out the door from the dealership, it was probably your change. The guy is still rolling around on the floor laughing.