I plan to service my 04 4.0L V-6 Toyota 4-Runner tommorow. (40,250 miles total on engine) Trans fluid drain and fill, PS flush and a new serpentine belt is on the list to do. Here is my oil situation , tell me if I should change it or how much longer I could safely run it. 5100 Miles on 5.5 quarts of Green (M04) GC and 15oz of VSOT. 2500 Miles is totally highway miles from my road trip from Maryland to Missouri. I added the VSOT right before the trip. This vehicle sees a daily 10 mile commute and gets driven frequently on the weekends (its our family car). It typically only gets about 2-3 minutes to "warm up" in the mornings. I am currently running a NAPA Gold oil filter. Should I change it? Or should I run it to 7500 miles? That is my max OCI for warranty. I have my 32cent per quart Pennz Plat. on deck for the oil change along with a Napa GOld filter. Please post up suggestions!