I have just come back from Tesco where I spotted Castrol Power 1 Racing 4T OIL

on offer for £3 a litre! The only problem is the oil is 10w40 and my bike takes

10w30. There was about 30 litres, and as I am going to change my oil regularly

from now on I really could do with buying the lot. Will it make a difference if I use

10w40 instead of 10w30? Please can someone explain it to me.

Hi

I would not worry about using 10w40 oil over 10w30 oil providing it is the correct oil for the task i.e.: motorcycle engine oil.

In fact the 10w40 oil will function over a wider temperature spread, so it should retain its protection/lubrication/cleaning, properties for longer

If you do an internet search for kinematic oil comparisons, you will find some listings for various comparison tables. they will explain it far better than I can,

+1

30 litres at 2 litres a year = 15 years! Worth buying a few though.

yep get some in they will do for your next bike too

10-30 FOR TEMPS FROM-10C TO +35C 10-40 FROM -10C TO +45C SO AS YOU CAN SEE THEY BOTH COVER THE TEMP RANGE YOU RIDE IN .BUT THE 40W IS A HEAVIER OIL AND WILL ROB A VERY SMALL AMOUNT OF HP.

SORRY ABOUT THE CAPS PUTER IS JAMED

The last thing I need is a slower bike, it is as slow as it is

I might just buy 4 litres as I am selling the bike in March,

I have just paid £10 a litre for the same oil (power 1 racing)

and that was cheap. Tesco have reduced it from £12 odd.

I'll buy 4 litres and that will take me up until March, I've

only just changed the oil. If I don't like it when I try it, I'm only

going to be losing out on £6 give or take, so it's worth the risk.

Thanks guys.

Got to be honest i would think clutch drag is a more likely problem than being able to notice any horsepower loss.

If it turns out to be wank, I will just change it and sell the other bottles on eBay.

How did the stiif changes turn out grouch"o ,,,

LOL funnily enough it seems to have sorted itself out more or less. It's still not 100% but it's

a hell of a lot better.

10w 40 will be fine, the majority of bikes in the uk will be running it.

I think the oil youve got is fully synthetic though, this has been known to cause clutch slippage on some bikes. A semi synth would be more suitable for your bike imo.

Yeah it's fully synthetic, it's to late now to get semi, I've got 1 litre of 10w30 and 4 litres of 10w40 lol, that should last until

I sell the bike in March.