I've got a 2000 Nissan Altima with 64,000 miles, regular oil changes with dinosaur oil
Every 3000 or so miles since new so I'm quite sure the motor is fairly clean internally.
I've read good points about full synthetic oils and in some of txgreasemonkey's answers
To some posts.
Wondering if it is wise at this mileage to switch over and any mnfgs names you might
Recommend i.e. Valvoline, Mobil. Recommended change intervals ?
Is there a chance of leaks developing ? The car does not leak or burn any oil.
Would a Napa Gold filter work fine with a synthetic oil ?

Thanks for your time, opinions and experiences!