What brand and type of oil did the factory put in the diffs? I have a 2005 ram 1500 LSD.

It came with mobil1 synthetic motor oil from the factory.

 

Wait......you are asking what kind of oil did the factory put in the differential and then telling us it came with Mob1 from the factory.............

Uh.....what exactly do you want with this post again?

 

3 bottles of 75w-140 for the rear. Fill to 1/2" below the hole

no friction modifier is needed, just the oil.

Do you have an owners manual? I'd look in there for specific amounts.

 

I was told by the service manager at my local dealership that ALL Mopar synthetic oils, whether it be crankcase, gear, etc. were contracted from Valvoline.

Now granted this was during a round of golf we were playing about four years ago, so it could be different by now...

 

I too would be surprised if it was Mobil 1 with the cost and all.
Don't matter much really. Synthetic is Synthetic as far as I'm concerend since I do regular maintenance intervals so the fluid that comes out is almost always still good. That's called preventative mainenance.

 

He has LSD, why would he not want the modifier?

OP - Almost no American production vehicle is born with synthetic motor oil in it. The only one I can think of is the Z06. There are probably others, but the Ram isn't one of them. When I changed the fluid in mine, I used Mobil1 ('bout four quarts 'cause of the PML cover), and seven ounces of friction modifier.

 

sorry for the confusion. I was saying the truck came with mobil1 MOTOR oil. The OP was asking what type of oil was originally in the diff's. I reckon the answer is that all the fluids were synthetic.

Thanks for y'alls posts