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Originally Posted by cpapashley
Good heads up on this one, I have had my suspicions when using any 91, the car pings and carries on something chronic, with 95 no worries.
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Just FYI, Cougar engines are designed to run on normal unleaded. Using premium fuel will cause premature combustion other words fuel will explode instead burning means detonation. The pressure in the cylinder will rise far beyond the cylinder's design limits. Piston rings will be worn prematurely. Knock sensor will retard ignition timing when it detects knocks and this will result in lack of power. So, whoever is still using unleaded, better stick to it for longer engine life. Engine in my cat has done 130k clicks and still takes 5W-30 and doesnt burn oil at all and oil remains gold in colour for upto 5000km.
cheers
Yogi