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Originally Posted by Adam
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Unfortunately, smaller blenders like RL continue to make these claims, which are based upon marketing, not technical fact. The factory fill has no GL rating of any type; it meets an internal spec set by the factory.
I am also not surprised that changing to any fresh oil would at least temporarily make the gearbox shift better; but the more important question is how will it behave in the longer term, and what will it do to the components? Ask some of the Nissan types that bought into some of the more questionable marketing claims that aftermarket blender’s GL 5 oils were fine for gearboxes designed for GL 4 oils, only to find that what makes an oil GL 5 precludes using it in any GL 4 gear box for very long.........