My manual says I must use Toyota Geniune Gear Oil LF SAE 75w (or equivalent) in my 2011 FJC. Toyota does have it (part # 08885-81080), but at $55 per quart (and I'd need 1.5 qts), I'm thinking I'll have to sell the FJ so that I can afford the oil. There has got to be an alternative equivalent that won't void my drive-train warranty, right? I wanted to use Amsoil, but Amsoil won't claim any alternative and they won't recommend their 75w-90 Severe Gear. Anyone else have superior experience with this? Looking for feedback.