- Dec 17, 2014
- Atlanta, GA
Hi all, I'm sure this has been asked before but I'm on my mobile and the search didn't find any relevant results. I have two cars that are weekend cruise / occasional autocross or drag race use and I use full synthetic in both. I put maybe 3,000 miles on the cars each year. Would the additives break down after a year requiring that I change the oil? I normally do 5,000-8,000 mile intervals on my daily drivers. I keep seeing Amsoil and others advertise oils as good for a gazillion miles or one year, whichever comes first.