Why waste your $$ No need for synthetic in your car. Given your driving habits, dyno oil is more than good. I run 10w-30 Castrol GTX in my SHO and always have. Regular change intervals are 2500 - 3500 miles given driving conditions. I also have an oil temp gauge and if i’m tracking the car or its seeing frequent high temps 2k. Haven’thad a problem ever. IMHO, I think changing your oil 5000 miles or more isn’t the best idea regardless of what kind of oil you use. Mine has plenty of grime in it after 3k.