A while ago I asked how far can you push PYB. I've decided to try it in my oldest car. Today I did an OCI with 5w20 PYB in a 4runner with the 5vzfe. I'm planning on changing again at 10k miles. Filter is a Fram TG3614. Will do a UOA with TBN at 10k. Based on dnewton3 and his results with WPP Supertech I'm betting this will be no problem at all.