It hasn't changed, it's just that there's misinformation abound. The standard recommendation is every 3000 miles for non-synthetic, which is very very wrong (t

It hasn't changed, it's just that there's misinformation abound. The standard recommendation is every 3000 miles for non-synthetic, which is very very wrong (too frequent) and serves to enrich quick lube shops at the cost of the environment. Folks with newer cars should NOT follow this recommendation [1], but instead refer to their car owner's manual. [1] https://www.scientificamerican.com/article/oil-change-truths/ https://www.scientificamerican.com/article/oil-change-truths...