Guys i see a lot of people are going with 5w20 and 5w30. My car has about 13,000 miles on it... Im not sure which brand to use either. I can get 6 quarts of royal purple for like 48 bucks on ebay... But im not sure which brand to stick with.. I also dont want to cheap out on oil. I plan to change it every 2,000 miles. Ive read most terminator owners change there's 2,000 - 2,500 right? Thanks for you help guys!