I have checked all the local part stores and none of them have royal purple 75w140! I did find some 85w140...Is this close enough?? I have an 01 Screw 5.4 with a 3.55, 9.75 rearend. I am changing out my axle seals becuase they are leaking...also what kind of RTV gasket goop does everyone use to reseal the pumpkin?

 

Just bought three bottles at (O'Reilly auto parts) 15.99 a bottle!

 

I think I found some at napa. I called and they said they had some...im going to pick it up right now. But its 17.99 there I dont think that we have O'Reilly's in utah. Guess I will just eat the extra six bucks, and its still cheaper then motorcraft.

 

Royal Purple Max Gear Oil 75w140, Round Quart Bottle, Pack of 12


List Price: $227.88
Price: $119.87 & this item ships for FREE with Super Saver Shipping. Details
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This stuff is so much cheaper when you buy it by the case.

 

 

Why? Redline is better.

 

How & why?

I just switched from Royal Purple to Red Line gear oil. Why? Because it was cheaper. But what type of "gain" am I looking forward to?