I'd agree with the above post. If you have been running synthetic for any length of time, I'd stick with it. I run synthetic in my 98 truck, but I put a lot of miles on it for work. In my bolt I run straight weight 30 because I can't find the 20 that's spec and 30 weight is fine in this desert environment.
Do you run a straight weight synthetic? Were do you find it? I've seen all multi weight blends and I was taught that straight weight oils are better for these older engines. Just curious.
