Liqui-Moly MoS2 for me. Been using it since 2005 in all my cars.
- Can quieten engines down a little bit, some more than others.
- Improved fuel consumption claims are so minimal it's impossible to measure.
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It's preventative maintenance, providing long term engine wear protection under extremes (like daily cold starts and hard driving). That's what I'm interested in.
- Some oil manufacturers still use it in their additive packages, for the above reasons.
- It's origins are military, like much of the cool stuff in this world (eg: synthetic oils and Ethernet protocol/the Interwebs)
I did heaps of research into use of molybdenum disulfide (MoS2) in engines to understand if it's a snake oil or not. There's LOT's of conflicting opinion out there... but opinion can only be used as a guide. I looked into facts and got comfortable that the science behind Mos2 stacked up.
Decided that Liqui-Moly MoS2 was the product I'd use, because:
(a) it was TÜV Rheinland certified (means it was independently certified in Germany to verify that it DOES do what it's designed to do), and
(b) it was readily available at car parts stores and fairly cheap.
Used it in a Mazda CX-9 3.7l V6 for 200,000km from new with 10,000km oil changes and it never missed a beat. Pushed it hard with lots of towing, beach & dune soft sand use and daily stop/start school, shop, errand runs... so it was exposed to extreme service conditions. When I sold it, the motor was still strong. Guy who bought it independently commented that it was the strongest of the CX-9 engines he'd test driven.
I use MoS2 with a quality synthetic oil.
Go here to
understand how Moly works:
https://www.bobistheoilguy.com/moly-basics/
Go here to
see how Moly works: