What brand of oil are you using?
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Royal Purple 150%
After years of experience drag racing recreationally and building motors (hobby) I will never go away from Royal Purple. I have had email conversations with the guys at Royal Purple over the years as well over the lack of zinc in the oil today and they have always impressed me. They do it right in my opinion and the extra cost is worth the peace of mind to me.
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I was using Castrol Magnatech 10-40 for years but recently I switched to Mobil 10-40. I know it is not the correct rating but 1st oil change I had 5 litres on Castrol and after checking several sources it said it was ok for the XJ8 so I bought another 5 litres and did the change. I use Champion oil filters.
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