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I'm assuming this is the "green grease" that they are referring to -http://www.greengrease.net/
I looked online real quick and it looks like napa and autozone sell it.
Don't think you ever need to worry about temps of 400 degrees in the steering head bearing. Only way to get that thing close to that is with a blow-torch...hehehehehe
It isn't necessarily the temp to which the grease might be subjected.
Generally speaking, the lower the temp rating, the lower the quality of the grease. While most grease begins with a base of mineral oil, it's thickeners and additives will play a very big role in the grease's ability to handle different conditions and resist dripping.
Over time, and depending on the additive package, a grease will begin to softening and "bleed" at lower and lower temps. That low temp stuff that worked well a year ago might already be breaking down this year.
So, use a cheap grease (low temp stuff) and you'll experience dripping sooner then using a premium grease (high temp stuff).
I pick this grease up since I believed it to be "special formulated" for the steering head. I serviced my before my last trip and notice a significant amount of oil spray on the left side of my fender, tank and chaps when I stopped for fuel. I couldn't find any sign of an engine oil leak and started to suspect my front forks although they were still functioning properly. The next day while doing a pretrip inspection I could see the oil was dripping out of the lower fork bracket. When I got home I picked up my grease gun only to have a significant amount of oil pour out of the bottom. It wasn't that hot out either.
I'm not sure if I got an extremely old tube of grease but it did exactly opposite of what I thought it was designed to do. I'll be switching to some high performance/temp synthetic general purpose grease we use at work. I have never seen it separate the way the Harley grease did.
I've been using Drydene SFG (synthetic fortified grease), it's almost pink in color and is commonly referred to as "bubble gum" grease. I have a few tubes leftover from the days of being a ready mix concrete plant mechanic, using it on bearings exposed to a lot of wash downs.
As it's slang name implies it is some sticky stuff. Once or twice a year I wrap a rag around the end of a screwdriver and wipe up what may work its way out. It doesn't "run" at all. I also smear some on my axles and spacers when changing tires so nothing ever gets a chance to rust. This stuff is rated for use in saltwater environments too, so it never fails. You can probably get some at a NAPA store or Tractor Supply where you can get large truck or farm equipment parts.
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