[Legomedic]

I have used Castrol GTX 20W50 since 1988. Neither my '74 2000GTV or my '81 Spider have "complained". I have heard the debates about vegetable oils and synthetics and additives and PTFE ad-nauseum, but I am of the school of: "Don't fix what ain't broke". One thing I must point out though is that we don't get any snow or sub-zero temperatures here (we range between 5 - 35 degrees C), I don't know if this may change things.