I use AMSOIL in engine, diffs, and t-case. in my 4R and LC. I use either AMSOIL or TRD oil filters. I've done all oil changes* myself, but otherwise had the dealership handle the scheduled servicing on my LC. At 10K service, I spoke with the the lead mechanic (who drives an LX himself) about AMSOIL vs Toyota lubricants for the above drivetrain components and his opinion was to go with AMSOIL.
*1,500, 5K, & 10K mi. AMSOIL states it's oil is good for 25K and its oil filters are good for 15K change intervals, but I think it's cheap insurance to change it more frequently. I bought the 4R with 26K on the clock and have religiously changed oil every 7,500 mi (it's only at 110K now). I will likely begin extending LC to that same interval as well. I have done 4R t-case and diffs every 20K and will do the same moving forward on the LC.
*1,500, 5K, & 10K mi. AMSOIL states it's oil is good for 25K and its oil filters are good for 15K change intervals, but I think it's cheap insurance to change it more frequently. I bought the 4R with 26K on the clock and have religiously changed oil every 7,500 mi (it's only at 110K now). I will likely begin extending LC to that same interval as well. I have done 4R t-case and diffs every 20K and will do the same moving forward on the LC.
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