I use MT-90 in my 240Z and I'll be putting it in the 280ZX as well. Its pretty much the number one recomended oil for those transmissions (as well as Redline MTL which is slightly lighter). It's crucial that they use the GL-4 as the high presure modifiers in GL-5can destroy yellow metal (bronze, etc) trannys. I don't know if the syncros in the 370Z are bronze alloys, etc. I use the Redline 75W140 (GL-5) for the rear diffs in my R180 and R200s.
That being said what is the cost on the above oils? I'll probably order enough to do my 280ZX and my 370Z but it obviously has to be worth my $$ so shipping as well. If its cheap enough I'll get the 5W30 as well for the 370Z.
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'09 370Z - '93 300ZX Vert - '83 280ZX - '83 280ZXT -'81 280ZXT stroker - '72 240Z - Stillen CBE, HFC, G3, Grounding Kit, Sways // Swift Spring // H&R 15mm // 5% Tint // Clear Bra // 
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