Discussion Starter · #1 ·
I live in high desert in So. California and the weather temperature usually go 90's to 100's during the summer. I need to know which one would be the best for my '71 with 429 rebuilt engine (about 600 miles). I just changed the oil with 5W-30 about 100 miles ago. Should I change the oil again for more weight? Which one is suitable for my car? Thanks.