Do Synthetic blends offer more Protection the standard Oil? I have a old Jeep With a 2.8L V6. It only has about 50,000 miles on it and primarily sees off-road beach driving. So would a Synthetic blend be better. The engine is pretty stressed on the beach. What oil would you guys recommend for this old jeep. Dyno, Synthetic or full Synthetic. Would a thick oil Like 20w-50 be better? Thanks