Not arguing that you have had good results in your Civic, but your results are hardly conclusive that Redline is the reason your civic has run so long. I have a friend that uses a 1987 Honda Accord for process service work and the car has 550,000 miles on it with the original motor.
He bought it with 150k, and basically just changes the oil with whatever is on sale every 3000-5000 miles. He says he got a bit lazy after 400k because that was his original goal and has been only changing every 10k or so (with mineral oil).
While redline is a good product, the majority of the UOA's have not been that great. Every time there is an excuse made, but the bottom line is no other oil (Mobil 1, German Castrol, Amsoil) needs to have these excuses made. For race and driving school applications, Redline is probably the best oil you can run, but for street use, there seem to be better.
Now before you say I am some redline hater, for the last 15 years, I have been using their gear and tranny oil, and also use their watter wetter and FI cleaner.
Cary