Let us take a moment to consider the design criteria of these cars.
Economy= 4 cyl ,saftey= somewhat heavy ,durable=good hardware.
4 cyl X heavy =high compression. That is the choice the
Swedish Engineers have made for these cars.
High compression needs high octane to burn at the optimal
moment to produce the maximum power yield.
I work my cars pretty hard, and would not consider anything
but what is recomended by Volvo.
Short trips where the engine is not up to correct operating
temperature is probably the source of most carbon build up
in a modern engine.
The Italian Tune Up that I get after 100 miles on a road trip,
kind of confirms my suspicions.
Different strokes...But my 145-S knows.
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White 86-245 DL, M 46, IPD bars & Wagon Overloads,Commando Bumpers,SS Belly Pan & Air Pickup,Straight-Shot EMT Chassis & Tower Braces,Scorpius Alloys,2 Belt No AC Conversion,Black POR-15 No Glare Front End