Hey guys, 1st post, WOW (deep breath, here I go). I have a 1989 Toyota P/U, 22RE, 4cyl, 5-speed, 2wd, w/ 100k miles. I am in Los Angeles, drive 1k-2k miles per month, lots of stop/go driving. OCI is about 4k miles. Owners manual specs an SL oil w/ multi-grade viscosity's of 30 or 40 wts. Am...