I park my car for the winter; I have been using Castrol GTX 5w30, and changing it each spring, which doesn't hurt the car, but makes my efforts with Blackstone labs kinda useless, given I haven't put more than 2500 miles on it in a season, yet.
I generally start it once or twice over the winter, which may or not make sense, but I wouldn't be averse to leaving the car alone, cuz I'm sure a few starts doesn't help the oil.
Anyway, I'm wondering whether or not I ought to start using synthetic, and going with the recommended/longer interval, based entirely on mileage, rather than yearly.
Thoughts?

