Originally Posted by Uncle Ben
I don't use Synthetic engine oil and I do and will continue to change oil and filter every 3-4k! If you do a lot of highway miles and chock up a lot of miles rapidly then you can go longer. If you short trip a lot, drive in dusty environments and or do not let you engine warm up before driving then short interval changes are your engines best friend! Flame on....
Oh dear... I am in agreement with UB...
Except I run synthetic and run longer intervals... but yeah, city driving with rapid heat/cool cycles and little time to boil off contaminants is hell for engines.