I replaced the transmission oil and transfer case oil today. It is a 2011 Crossover and had 8160 miles. The manual says change the transmission oil at 7500 and the dealer didn't do it. The transmission oil came out nice and clean. I wanted something synthetic in there for winters. I don't know what the original Suzuki stuff is. I put Redline MTL 70W80 GL-4 in. Redline makes a big distinction for their transmission oil from differential and transfer case oil. Their point isn't the one about corrosivity, but the character of the oil need for the synchros, with differential oil being "too slippery". The fill plug required a hex wrench, different from anything else. From the little bit of driving I did afterward, the shifting seems smoother. Not that there was a problem before. The transfer case oil was black with a gob of goo on the pug. Both the fill and drain plugs worked with the plain wrench from the socket set as has been described by others. I put Amsoil Severe Gear 75W90 GL-5 into the transfer case.