Like many other BR's I visit other car forums from time to time, I've read quite a few contributors suggesting other users move away from manufactures recommendations regarding servicing and in particular the grade of oil that should be used.
I've been in the belief that oil makers and manufactures have spent many a few quid in research for the best grade of oil for the type of engine used, for instance, my 2L PD engine has always had a diet of 5w-30w (Castrol Edge or SLX III as it used to be), but I've seen that some drivers are recommending a different grade (5w-40w).
Will this make a real difference? and if so will that be good or bad
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