Hello! I have a new 2.4 L Tacoma that has 4k miles on it now. I have done two changes with dino, one at 1k miles and the other at 3k miles. At 5k I want to switch to synthetic for increased proctection in the winter (I live in Michigan), but I plan to stay on synthetics from here on out. I put on a lot of miles, roughly 90 a day, and they are mostly freeway. I'm considering Mobil 1 and Redline. Ideally I would like to use Redline, but it is a bit costly and not as convenient to find. However, I have read that Toyota engines in general really like Redline. I figure that I could use Redline if my drain intervals are extended enough to warrant the increased cost over Mobil 1. So I am wondering, between these two oils, which would you use and for what intervals? Also, if I am doing an extended drain, say 10k miles with Redline, should I change the oil filter halfway through?