Preface: There's no good way to study this as I can think of. Most of the "testimony" on this site is... "I was Using George's Ultra Super Oil" and then I switched to "Freds Magic Oil" and the car runs sooo much better..... Personally, I've found that I THINK the car runs better after changing Brand X to fresh Brand X out of the same case... As an involved subject, my opinion is clouded. If I was running a shop, there would be an ethics violation if I guinea pigged on clients... So here's what I came up with.
My Wife's daily driver... (2007 Escape) 86K... It's technically my truck. She's the only one that drives it. Like a smart lady, she lets me KNOW when it needs serviced. So.... THIS TIME, Instead of the 5w20 blend, I put the 5w30 blend in it. Same model/make filter and all. Only difference is the oil's "Grade". So not telling my wife, we'll see what happens.
My Wife's daily driver... (2007 Escape) 86K... It's technically my truck. She's the only one that drives it. Like a smart lady, she lets me KNOW when it needs serviced. So.... THIS TIME, Instead of the 5w20 blend, I put the 5w30 blend in it. Same model/make filter and all. Only difference is the oil's "Grade". So not telling my wife, we'll see what happens.