[BitWielder1]

My current car recommends oil change every 3000 miles, which I never do.
For a car I had 20 years ago it was every 7500 miles and that's when the oil change places stated to tout their 3000 mile business.
Between the car manufacturers who want to sell cars and the oil companies who want to sell oil, I thought 5000-6000 miles was a reasonable compromise.
Once I had an old car that burned oil so I had to add a quart every 2 weeks.
I figured that was every bit as good as an oil change every 2 months and that worked just fine for several years.

[jdsteel]

Newer cars say 6000 miles. Places that sell oil changes say 3000. I get a traditional (not synthetic) good quality oil change every 5000 miles in the moderate climate of PA. I change the air filter every other time and I regularly get 100k+ trouble free miles from an engine. As a matter of fact, the decision to get a different car happens despite the fact that the engine works great.