Wanted to get opinions on this - my 2006 2.0 has had motorcraft 5w-20 syn blend for every oil change since new for all I know. I inherited it from my grandmother who took it to dealer for changes, that's what they used and I've used since I got it in 2018. Thinking about switching to pennzoil platinum just because the great yearly rebate deals, I can get 5qts for $12 after sale and rebates. Car has ~85,000 on it. I've heard about oil leaks appearing after switching - any thoughts on if best to stick with motorcraft, go with penn plat, or try penn plat high mileage? Just want to avoid any possible oil leaks popping up.