I have an un-riced 2000 Civic Si with 72K miles. Great engine but in cold weather there is some bearing or "something" that squeals on startup. It'll be noisy for around 15 secs. It's enough to make a car guy cringe.
Even though I change my oil regularly I figured I'd try a full synthetic instead of 5W30 Penzoil dino oil. What a difference! This whole winter the "thingie" hasn't squealed once. Not even a little.
I'm sold on synthetic. I just hope I haven't created any seal issues. So far, no drips on the driveway.
