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I changed the oil in my 950 after watching a youtube video. My owners manual calls for 4.1 quarts. Is the .1 worth buying another quart? I think My wife's 650 calls for 2.9 quarts. Why can't Yamaha just go with 4 quart or 3 quarts? Is this a product of not using the metric system?
 

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I changed the oil in my 950 after watching a youtube video. My owners manual calls for 4.1 quarts. Is the .1 worth buying another quart? I think My wife's 650 calls for 2.9 quarts. Why can't Yamaha just go with 4 quart or 3 quarts? Is this a product of not using the metric system?
Can't speak to the 950, but the service manual for my 650 calls for 2.7 quarts for a "periodic oil change" but exactly 3 quarts when replacing the filter.

My Roadstar service manual calls for 4.3 quarts with an oil change, but literally thousands of people on the Internet assure me in multiple forums, that this is too much oil. In fact it takes exactly 4 quarts.

The bulk of the oil in the Roadstar sits in a sump which gives some freedom of range. You might want to do some checking and see what Google says. I don't want to give you advice that contradicts your manual, but I contradict my manual every time I change the oil in my Roadie. So do a lot of other people with 150,000+ miles on their Roadies too.
 

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i've only ever put in 4 quarts when changing my oil. i always change out the oil filter as well. if you don't change the filter, you could probably put in about 4.5 quarts.
You've obviously been here for a ton of time, but did you mistype possibly? The filter holds some oil in it. Using an extra half-quart when NOT replacing the filter doesn't seem quite right to me.
 
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