Dave, Toyota recommend 75/90 GL4/GL5, (but that was 25 years ago ;-) ) so assuming you are in cooler climate, 80/90 could cause cold-shift problems.
A lot of cruiser owners in Aust. swear by Castrol VMX-M for smooth changes.
Mine has Redline synthetic in it (was there when I got it) but when I...
Geert, just for you information, the HZ engine was made in a turbo version known as 1HZ-T and many thousands of them were fitted to Coaster busses, model was HZB-51 I think.
They were available with or without factory intercooler.
Cheers, PhillT
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