I bought some Halfords 10/40 semi-synth when I bought my VR6 the other month just as a peace of mind for me that she has new oil in her. Anyway after having a hunt around my garage for stuff to sell I found an unopened 5 litre bottle of Total Quartz 7000 (10/40 semi-synth)
Question is.....Shall I drain the Halfords oil and put the Total Quartz in there instead, which of these 2 would be the best?