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Why not Del 1 ESP 5/40?

I cant seem to find anything on the forum. The reason i ask is, a few years ago my family and i took a road trip to colorado in a '99 ford taurus with a 3.0 and 150k. I did a basic tune-up and with the oil change, i added a bottle of Z-max. I also added a set of Bosch +2's. Granted, i didn't...

Im going to pick up a 2000 grand marq that requires 5/20. Whats the diff if i switch to Mobil-1 5/20 EP or 0/20 EP? Is there any mpg/protection difference between the two? Is Delvac ESP 5/40 too thick? The car only has 144k and is in good shape and no cam phasers to deal with.

Hi, guys! New here. I work for a small Mobil dist. And I deliver to a small european car mechanic that uses Mobil 1 0-40. Im FAAAARRrR from an oil expert in any perversion of the term, but whats to keep a guy from running D1 ESP 5-40 in something like an old pushrod motor if its good enough for...