Hello, everyone! This summer I'm going to replace all the liquids in my cars: the automatic transmissions, the transfer case, the axles and so on. I've fixed my attention on two brands: Valvoline and Amsoil. It's very difficult to buy them in Russia (if we are talking about Amsoil it is extremely difficult), but reading this forum I got strongly persuaded in their quality. Moreover, I've been running with Valvoline synthetic multipurpose grease and it works awesome! It's a very difficult choice for me, because Amsoil costs a huge sum of money and is twice as expensive as Valvoline. But is it twice as high-quality? Do Amsoil produce real long life oils? I change motor oil every 3000-5000 miles, use only synthetic. I change other liquids every 25000-35000 miles. Can Amsoil really allow me to change motor oil every 7000-10000 miles and other liquids every 50000-60000 miles? If not, I'm for Valvoline. What do you think?