Highly variable, even for cars of the same make/model due to driving conditions.
For instance, my ‘85 Corolla recommends every 3months/5K miles under severe conditions (which most people fall into) but I run into problems if I go much past half that. On the other hand, I have seen Dodge Darts go without oil changes for years.
@Coloma That is more an indication of the condition of your oil, and the 3K guideline is merely the minimum mileage you will go before you may have broken down your oil, at which point you should change it just in case. If your engine is in decent shape and you don’t drive like a fucktard then you should be able to go further.
@Blackberry If I went by that, I would be doing oil changes every 1½ weeks/500 miles at best! Trust me, after 26 years and 230K miles, my 4A-LC engine can make oil pretty damn black in a hurry.