badrich;
Just my opinion,if you plan to do any kind of racing,go with
synthetic,if you have a street driver/cruiser, stay with conventional....
I use
synthetic in my car now that I mostly do open track events.... Normal is anywhere from 10 to 15 laps on a road course from 1.3 to 2 miles long,lap times as low as 1:29 to 2:00 minutes,so an average session is around 15 to 20 minutes running mostly in the 3500 to 5500 rpm range,engine builds a lot of heat and I find the
synthetic oil does a better job of holding up in extreme heat and racing conditions..... For a driver/cruiser synthetic is not needed and conventional is fine....
Later this year when my project car (65 Mustang Coupe) for racing only is built and running my 65 Fastback will not see anymore track time and I'll go back to conventional
oil in it....
David