PRO50SC

Why do you add more friction modifier when it already has it in it?



Royal Purple here as well and a gasket cuz my new cover came w/ one.

dillon1340

royal purple 75 90. gasket and rtv. i use it because i've always read good stuff about royal purple and it has the friction modifier in it already.

Portmaster

When I do a rear (in most cases) I put new clutches in it as well. I soak the clutches in friction modifier before I install them. I take the friction modifer add it to the Mobil1 and install it. Ford started doing to same thing on the Terminater Cobras in 03 so I figured my way was OK being I had being using that combo for a good while. Plus it stinks so good, lol

Timspony

We call the friction modifer "skunk ****" ...

Portmaster

Close, we call it skunk oil. I can smell that stuff for a month in my hands and wash my hands prob 30 times a day. Maybe need to wash hands in tomato juice, lol

Timspony

Good point! ...lets try the tomato juice

PRO50SC

Oh OK, I never add any extra since it was already in there.

cleanfitty

It seems like I'm the odd man out, but I when I changed mine out, I used Castrol Hypoy C 80w-90 and a bottle of MC friction modifier. The only reason I chose that is because it was the only jug that has the Ford ESP-M2C154-A spec number on the bottle that the service manual suggested.

I also used a Fel Pro gasket without any sealer.

83glx5.0

I used either royal purple 75w-140 or Valvoline 75w-140 full synthetic for limited slips.

zeekstr

Excellent. Thanks.
Now that you have stated why you use what you use, have you noticed
any difference than what was originally put in from the factory. If you
have a vehicle that you purchased used and are unsure of what was in
it, do you notice a difference in performance, longevity, etc.?