Yes, the Royal purple I used has the Fric Mod already in it. I didn't have to add any additional. Its working as its supposed to. I did a search on this subject a while back and found that many guys had added FM, and many did not. Some added it to no avail, which probably means their clutch plates were worn out in their LS. There is a lot of interesting reading on that subject too! I learned that the 75W90 was fine for my application: daily driving and occasional light/med towing. The 75w140 is preferred by the regular towing guys.