Thinner isn't necessarily better.
One example would be the Mazda RX-8. Mazda specify Dexelia 5w30, but from experience the specialist engine rebuilders recommend changing to a 10w40.
Another would be trying a 5w30 in a FIRE 1108 engine. It burns it and pours it out all over when given the beans.




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is the castrol oil worth getting? or should i try somthing else? don't really want to pay more than £30 for 4ltr of oil... recomendations would be nice
thanks for the advice, picked up some castrol 10w-40 semi syn at asda this morning they have it half price for 4L of the stuff

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