I am a late comer to GT86 ownership and as such many of the teething troubles and discussions are long gone as are some of of the experts and the owners.
My questions are simple as are my comments.
Oils!
Extreme confusion re right engine oil, just go into auto store and type in to the oil advice.
zero w 20 suggested, by Toyota, 5w by Subie and most oil guys.
mobil one?
diff oil? must have friction component. GLS5
gearbox api spec?
Fuel.
98 ron ok.
avgas no too dry.
10/94 ethanol ok according to Toyota.
95 ron?.
Brake fluid as supplied useful for normal driving.
pretty poor in mountains on winding roads.
GT brakes underdone bias fair.
can be rectified by fitting brz attach brackets brz gts rotors front 299 up from 277
and rear vented same diameter but more rotating metal so runs cooler at 18 mm vented instead if 10 mm solids, and retaining gt calipers throws bias back to the front by a few %
dba pads or hardie ferodo metals.
see mtc racing utube video.