I use cstrol syntec with great results. But, if your motor has alot of miles it might actully start leaking or smoking when you switch to synthetic oil. Synthetic ssems to find its way through smaller gaps then regular oil. I wouldnt advise it after about 50,000 miles. Some people can use it with more miles and not have a problem. It all depends on how your motor was takin care of. You can use a synthetic blend without much trouble. As for filters, I use the Napa gold. It is made by wix. I used to use fram thinking they were a good filter. Then I saw cutaways of many of the popular filters. Fram was one of the worst as far as build quality goes. Kendal is a great oil also but like someone said its very hard to find here in oregon. Also you might try the lucas oil stabalizer. I use this straight in my differentals, tranny ,and t case. It seems to quiet them down alot, and it also sticks to the metal much better than regular gear oil.