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Not sure of the previous history but i've ran 93 since the day I picked mine up over 2 years ago. I also try and stick with Shell every time but will go to Chevron or Mobil if I have to.
I run a 93+ and never looked back, my engine runs better quieter and I get a better fuel economy. This is not my dd though and I only put 4-5ka year on it
It might say premium on the cluster for a reason....(and that odometer is legit)
600k with working needles? wow!
I used 91 for the 92 sc400... i am just afraid the old knock sensor + OBD1 system is not as sensitive and durable as current one. a knock sensor cost at least $150.....toyota recommend premium fuel for a reason. unlike newer OBDII toyota...they just say for maximum performance premium fuel is recommended but not required.