Not that I haven't taken heed of all the posts on this, but to my brain at least, the following excerpts (below) seem to make sense to me, and here's why:
If there were no difference (negative) in using 0W Mobil 1, why doesn't everyone run it, and thus receive the (claimed on the bottle) benefits of better fuel mileage, and better cold starting (if that's an issue where they live) than the other weights of Mobil 1? In other words, most people would be running 0W if there were no side effects. Brian 83 240D 84 Saab 900 (received the 0W30 Mobil 1 last night) Curt wrote: I'd put 0w40 into my 240D and it leaked like crazy. Maybe a quart in 100 miles. I tried 5w40 (this was a couple years ago when the 5w40 was easy to find) and it leaked maybe a quart in 300 miles. 15w50 leaked a quart in maybe 350 miles, same with conventional 15w40. (snip) and: What have you been running in it up to now? You're mostly right about how the oil works but it is very thin and you shouldn't be surprised about it leaking more. (snip)
