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Just got off the phone with tech support at Mobil 1 and asked them if Delvac 1 was safe for Yellow metals. The answer was no. I then asked, what if the operating temp was below 250 degrees, then the answer was yes, it's safe for yellow metals. Case closed for me. When I redid the install of the...

This is exactly why I was asking the question. I would much prefer the benefits of a GL5 oil. If the yellow metal issue with GL5 oils is only at high temps, then this a complete no issue, even my rear hubs, that are a pretty good indication of the diff temp since they share the same oil are only...

But the oil that would be in contact with the spindle bushings is the oil in the hub, correct?

Okay, so I've spent more time than I care to admit trying to find a GL4 gear oils. Most of the oils, like Valvoline say GL% and can also be used in GL4 applications. However, from what I have learned from talking with the tech folks at several major oil companies, is that a gear oil cannot be...

Curious which GL4 oil you are using?

Amazingly, not much comes up when you search for "gear oil" relative to what is required for the Meritor axles. My understanding is that GL4 gear oil is specified and I'm curious if that is because of GL4 being safe for yellow metals? Reading through a Meritor maintenance document, they...