ive recently changed the oil in my vx calais 5.7 using castrol edge 10w-60 but since i have done that its seems to be making tapping sort of noises, im thinking the oil is a bit to thin for it, i would like to keep using castrol edge just wondering what grade i should use, the car has 150,000kms, and also wondering what products to use for the rest of the service, ie spark plugs, air filter etc, thanks
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