I thought it was a bit weird they told me to up the weight, but they are usually knowledgeable at the store i go to. I have read good things about Valvoline Maxlife, and i only use synthetic, so i think ill give Maxlife Full Synthetic a try next time, with the wix filter i always use unless mobile 1's r on sale. I've read good things about the maxlife. I've also heard it helps stop leaks and condition seals. it is a bit expensive, but ill try to save a couple bucks by ordering it on amazon with free shipping (i have amazon prime)