I hear in some markets they specify thicker oil than 5w20. I’d like to verify if it’s true. The reason being I’d like to add a small amount of ZDDP additive to the synthetic oil but it would slightly thicken the oil. I have my reasons for this. They’ve basically removed it to extend the life of catalytic converters. I call BS since my 83 Grand marquis had high ZDDP oils for years and is still on the original cats. It does help wear, I’ve tested it in a bunch of small engines.
If it extenuated the life of the engine I’d be well past any warranty anyway. I use it in a few other vehicles such as my 06 Fusion which still sounds better than most of those of a similar age and mileage.