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http://www.synthetic-oil-tech.com/Gear Lube White Paper.pdf
Sorry if this is a repost. I find this interesting. Although mostly GL-5 75w-90 are tested, it does say a lot about the quality of the brands. It appears AMS came out on top. Redline was so and so. According to AMS, the difference between their GL-4 and GL-5 is that GL-4 has half the additives for extreme pressure. So technically they are very similar in terms of other additives and chemicals used. The results of the test backed up the claims about their products, including the specifications. I'll be using 1 bottle of AMS extreme pressure and 1 bottle of their GL-4 synthetic in the C60.
Sorry if this is a repost. I find this interesting. Although mostly GL-5 75w-90 are tested, it does say a lot about the quality of the brands. It appears AMS came out on top. Redline was so and so. According to AMS, the difference between their GL-4 and GL-5 is that GL-4 has half the additives for extreme pressure. So technically they are very similar in terms of other additives and chemicals used. The results of the test backed up the claims about their products, including the specifications. I'll be using 1 bottle of AMS extreme pressure and 1 bottle of their GL-4 synthetic in the C60.