[o6r1man]

Thanks guys!! I ran out to the local gm dealer and they were out of the additive and didn't think they would have any by the weekend so I ran over to the ford deal and they had it. So I picked it up and guess I'm going to use that. If I run royal purple and it says it doesn't need the additive do I put it in anyways? Or should i run regular 75/90 so I can run additive?