I've always been taught by good ol' dad to change every 3K or 3 months. Now, however, the school of thought is changing.
Did anyone read the article (I forget which pub - CNN, ABCNews Online, MSNBC?) where they did a three year experiment with NYC taxi cabs? I wish I could dig it up again.
Anyway, in the experiment (and I'm sure I'm not remembering this exactly), one taxi had its oil changed every 3K one like every 10K and one just once during the three years. Oil was added as need to all three cars to make sure they were always filled. The result, almost no difference whatsoever. Shocking considering that almost no vehicle takes a tougher daily beating than a NYC taxi cab.
I'm not suggesting anyone go this long between changes, I know I'll still get my changed between 3K and 4K. But, I won't panic if I go over that by a little either.
Makes you wonder, who started the whole 3K rule anyway? The oil companies?