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After much study of oils used in race engines, I have come to the following conclusion.
When a race engine has just been rebuilt, all the moving parts need bedding in, use a cheap oil that will keep everything cool but will allow the metal parts, rings etc, to wear in. Once everything has had a chance to bed in, about half an hours driving, I then use fully synthetic oil, as this gives maximum engine protection and virtually no engine wear at all.
10w/40 is fine, 10w/50 is better.
It is vital to observe the oil pressure at all times, and the temperature should be monitored too, between 80 and 100 centigrade is about right.
Of course everyone has their own preferences, this just seems to work on the race engines I have worked on.
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