The difference would be that the 18 speed has one more gear to chose from than the 17 speed. But while 18 speed is easily doable on a bicycle I can't come up with a way to get a bike with 17 speeds - unless you're counting like this:" when I am using this gear I still have 17 others to chose from."
the difference between 17 and under 17 years old is that under means younger than 17 and 17 is just 17.
The difference between -17 and -8 can be represented by the expression (-8 - (-17)). This simplifies to (-8 + 17), which equals 9. Therefore, the difference is 9.
17...
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17.
17.
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17
If the converter is drained, then about 17 quarts of fluid will be used. 75W90 is the recommended transmission oil to be used.
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28