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I am looking for an equivalent to the little tube of stihl headge trimmers gearbox grease? Any suggestions?

How can a gear oil be formulated to achieve gl-3, gl-4 and gl-5 in a single bottle? My understanding is that the high pressure additives are increased over each other.

Car in question is a 2006 Subaru sti. The manual only recomends a SAE 90 wt. Subaru's lsd 90wt is no longer available, it has been replaced with a 80w90. This rear end has a limited slip differential that requires a friction modifier. Should I use the Subaru branded 80w90? Should I find...

Car is a 2004 impreza with the 4eat automatic transmission. Manual recommends 80w90 for the front diff and 75w90 for the rear. I just usually run 75w90 front and rear... But its time for a fluid change. I have in stock 80w90 gl4/gl5 (how does this meet two different specifications?) I also...