Well I came across this earlier.
Castrol Magnatec 5w/30 Fully Synthetic .SPEC API SL A1/B1 4 litres £28.00
Car Lube 5w/30 Semi Synthetic SPEC API SL A1/B1 5 litres
£14.00.
Which one would you use? If you change your oil and filter at 3000 miles ,
does it really matter whether its Full or...