My '97 has 214,000 miles on it now. I know it's a tighter clearance engine, but at this point should I start using 10w30 instead of the 5w30 that I have been?
I'd personally say continue using what you have been. If the motor lasted 214k with your fluids and service schedule and TLC, then no reason to change it now. Congrats on a high miler 4v!