My 1994 Astro van is close to oil change time, I changed it 15 months ago and have put 2,620 miles on the change. It is only driven on the highway, never less than 40 miles, it is never driven short distances or in town traffic, so what interval should I change the oil? The oil looks as clean as the day I changed it & never had to add an ounce. I used Valvoline Nextgen 5w30 and a Fram ToughGuard filter.
Thanks for any input
Thanks for any input