This is a great website with a plethora of automotive information, including expert-mechanic Mark Salem's recommendations for the best brands of auto parts and his recommended maintenance schedules. For example there is 2-3 pages on oil and oil change intervals with easy-to-understand analogies describing the difference between regular, blended, and full synthetic oil. There is much, much more.

http://www.salemboysauto.com/default.htm