Which Slick 50 to add using Castrol Magnatec 10W40 A3 B4 Oil 4 Litre (Cat code: 918615-0 )
There are 2 versions of Slick 50 engine treatment listed - one for standard oil and another Hi-Performance treatment for synthetic oil. Which do I use for the above oil which is part synthetic?
(For info I have a '93 Peugot 306 1.8XT)
personally I would not use any additive. oil companies invest millions, why dilute with an unknown snake oil which may or may not work (anyone ever independently evaluated?)