Hi guys, Ive got a few questions in one. I picked up a bottle of M1 5w30 for the winter for the ls integra. I've heard it shears to a 20 weight which is fine for the winter but not for the summer and the occasional track use the car sees. I want to stay with one brand all season long. Would a 10w30 in the summer be more stable?

Also, mobil1 didnt show the best results in the four ball wear tests Ive seen, so would a 10w30 be better for that as well? I like Mobil, but I'm starting to question it. I switched from castrol, after hearing it wasn't a full synthetic. I have amsoil locally, but damn...pricey stuff. Are there any abid autocrossers or hpde guys still using Mobil1 with good results? And at what weights? Thanks./