As I stated my dad has always used castrol RS for 18 years and had no probs in a highly tuned westfield pinto. This was the only oil to give good pressure at hgih temps when used hard. It gave me great oil pressure even when used hard in my cossie and I won't be using anything else. I appreciate that oil pressure is not as important as throughput of oil etc etc etc but I can only tell you my experiences. Why not try it as its not much for the cost of a few litres.