there are some synth oils out there that claim to have the friction modifier additive in them but you will have to read the label. My .02, if you change your gear oil regularly, you might save your self a little coin and stick with conventional oil, and a friction modifier. If you dont mind spending, get a high quality synthetic, and add a friction modifier. LS clutch packs are spendy enough that a $10 tube of additive is good investment regardless of what the oil bottle says