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I'd stick to manufacturers spec of 5w40... Opie oils have a few really good fully synthetic 5w40 oils for a similar price, plus 15% off engine oil deal at the moment!!!

I just picked up 5L of Fuchs Titan GT1 5w40 for £25 from them!
 

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Mine is 8v and manufacturer says 10w40. Why can't I use a 5w30?
Hi, 5w30 is too thin when its hot
The 5w40 is better than 10w40 as it is slightly thinner when cold so will circulate quicker when its cold and being fully synthetic will stay in grade longer when hot.
As said a regular good quality 5w40 is about £25 so no need not to use it.
 
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