The manual says that the oil in this car should be changed every 7,000 miles or so. I am very skeptical at the duration of this interval. I drive exclusively on the highway to and from work. I live and work within 1 or 2 miles of the HWY on and off ramps. I currently change the oil at around 5,000 miles. Will this ruin the VVTI system on this car?
The reason I am asking this question is to find out if changing my oil every 5-7k will ruin the VVTI system in this car. I have read online that not changing your oil often enough will ruin these systems in Corollas. Now I understand its common sense to change your oil often, but with all highway miles, will this car be OK changing the oil at 5,000 miles.