Intragration said:Toby, do you have any specs on the STP Oil Treatment? I haven't been able to find official word on how much ZDDP is in it, but based on some things I've been able to find, adding just one bottle (and depending on how much is in the oil you're using) may not bring the zinc levels up to what's in the VR1. There are other products that are made specifically for adding ZDDP, which may contain more. For some reason, it bothers me that the additives have to mix into the oil, as opposed to being a part of the package. I'm sure STP and the others don't hurt, but I feel more comfortable using an oil that already has the zinc built in.
You know I havent researched it all that much. Mike over at TA PRM said run a bottle and you will never have problems. I agree with security and running the VR1 I have heard it is good too.