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View Cart | Product Description Advantage NEO Hi-Proof Shock Gear Oil $25.95 Return to Products EXCLUSIVELY from Mann Engineering!!! We are finally able to bring this oil back from Japan to be sold here in the US. This is a very high quality fully synthetic gear oil. It is rated as a 75W-140 oil. Even though this oil might seem thick, in the gearbox, it feels just like a standard 75W-90 oil. It works great in the Subaru 6MT and 5MT transmissions. We also use this in the rear differential for our shop 07STI and 02WRX rear differentials. Note: Price is per quart of oil.