Expy Owners;
I had my engine oil changed last week at a Shell Express Lube. They asked me if I ever had the differential lube changed. I said no. They asked if I would like it changed with the "recommended" synthetic lube. I said yes, since the truck has 48,000 miles on it. So, they changed it. Now I notice that during cornering I am getting a shuttering feel and sound. I have a 2000 EXPY with the towing package and limited slip dif. Do you think the Shell Express Lube techs put in the wrong lube? I never heard or felt this before and I am concerned that I am tearing something up in the dif.

 

I got the same situation when I had it changed a few months ago at the Ford dealership. It is even more pronounced with a trailer/load on the back. I was hoping that this is just the clutches working better with new friction modifier in the oil. Am I correct in my thinking?

 

Sounds like they forgot the friction modifier additive to me.

 

For the price they charged me, $38.00, they better not have forgotten. Sounds like a visit to Shell Express Lube is in order (I doubt they will admit to any wrong doing).

 

Yeah, it really does sound like they forgot the friction modifier....Take care of it ASAP..

 

They forgot it!!! It is like 7 bucks from FORD and is not sold in auto parts stores at least not in AZ. Also the recommended 75-140w Syn oil from ford is 28 dollars a quart thats right a quart and the rear holds 6 pints. So for 38 dollars including labor you did good. I hope for your sake though that they did not put in a simple cheap 75-90 weight oil. The heavy EXPY needs the viscosity of 140 weight esp for towing and the tolerences were designed for the thicker oil. I can only speak for the 99 model year though.

-Dave

 

Sounds like they forgot the modifier. Ford says to put the modifier in first and then the fluid.