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Old 11 March 2015, 20:17   #1
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Country: UK - England
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What grade of oil ??

About to do an oil change on a Yamaha F100 A .Online manual says 10/30 or 10 /40. I have bought 10 /30 which looks way too thin,surely on a hot summers day and in an engine at 5800 rpm it will be like water, sould I use 10/40 instead ?, just wondered what others use in the UK.
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Old 11 March 2015, 20:32   #2
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Doesn't matter if it's like water as long as it's slippery. The hot summers day won't make a lot of odds-your cooling is still coming from cold seawater and regulated by your thermostat
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Old 11 March 2015, 21:36   #3
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Why use anything else - it does exactly what it says on the can
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Old 11 March 2015, 22:18   #4
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Yup that's the can I have,...if it's good enough for you,...then it's good enough for me,...... in it goes,

cheers for the replys
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