I picked up SuperTech V Twin 20w50 on sale last summer and have enough for a couple oil changes. Haven't seen/found info on the additive package. Been a Mobil 1 4T and 20w50 VTwin convert for years, but couldn't turn down a good price on the SuperTech. Worst case I use it to top off that extra third of the quart instead of opening a fourth quart of the M1. But an additive package would be a good thing to know about.