Thank you guys both for the replies back. Now I was at I think Kragen this weekend to pick stuff up for my daily driver, 89 Toyota Pick up, and asked about full synthetic motor oil. The guy asked how many miles I have on my car and I said 68K and he said it’s too late to switch over to full synthetic and that if I wanted to use full synthetic I should have done it at under 10,000 miles (couldn’t have because I didn’t get mine until it have 13K miles). Is this true (my R has too many miles to switch over to full synthetic)or can I switch over my R to full synthetic even though I have 68K miles on it? Thanks again.