octane

[twinkey1]

i have a 2003 dodge stratus 2.4L sxt 4 cylinder-manual calls for 87 octane but im using 85 octane,will that be OK to use,i live in Colorado springs,Co,

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[pearl01stratcpe]

I would at least put 87 in it. You don't need engine knock.

[twinkey1]

i was told 85 would be ok,cause the altitude is higher here,is that correct

[pearl01stratcpe]

Originally Posted by twinkey1

i was told 85 would be ok,cause the altitude is higher here,is that correct

Wikipedia says it's ok... http://en.wikipedia.org/wiki/Octane_rating

In the Rocky Mountain (high altitude) states, 85 octane is the minimum octane, and 91 is the maximum octane available in fuel. The reason for this is that in higher-altitude areas, a typical combustion engine draws in less air per cycle due to the reduced density of the atmosphere. This directly translates to reduced absolute compression in the cylinder, therefore deterring knock. It is safe to fill up a car with a carburetor that normally takes 87 AKI fuel at sea level with 85 AKI fuel in the mountains, but at sea level the fuel may cause damage to the engine. A disadvantage to this strategy is that most turbocharged vehicles are unable to produce full power, even when using the "premium" 91

[twinkey1]

thanks for the info