Originally Posted By: mightymousetech
Originally Posted By: burla
The real question is with all of the new sparce additive low visc oils, why do more companies not have high moly. Can only be good for the direction auto manufacturing is going with the di turbo's. get you some lubeguard's biotech.
Moly is bad for cat converters and O2 sensors.
Do you have a reference source for this info? This is news to me. The EPA specifically bans use of phosphorus over 800 ppm in ILSAC oil to make the cats last, yet nobody worries about
moly fouling cats or O2 sensors. For example, Mazda Genuine Motor Oil has 700 ppm moly (very high), and Pennzoil Ultra 0w40 for Chrsyler's SRT engines have 275 ppm moly, and they both have cats/O2's to protect. Most oils have less than 80 ppm moly since friction benefits are almost maxed out there. Any more and it starts to function as an anti-wear additive.
Moly can fill asperities in newly machined engine surfaces and reduce hot spots during break-in, so the legend goes. Very reasonable and lines up with Honda's recommendations.
Originally Posted By: tojo1968
Originally Posted By: BKTX
Very recently I happened to check 2018 Honda CRV. It had less than 500 miles on it. I noticed that the color of engine oil is kind of dark greenish. Normally all new engine oils show as golden during oil change. So is this factory filled oil different?
It's dye they put in the oil to check for leaks. My 2014 Focus ST was the same way.
I've never heard of FF oils having the UV-light visible dye already there, though Castrol OE oils for dealerships have it:
Technicians can simply add a little UV dye separately if they want to track down a small leak so it doesn't have to be in the oil in the first place.
Moly does darken the oil by itself, although not green.
Mazda Genuine Motor Oil has a ton of moly in it (~700 ppm) and is black, not green.
Liqui Moly MOS2 additive is black, and can be added to break-in oil if changing it out early and you want the benefits during break-in.