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I ran my original race engines on cheapo oil, Comma 20-50 which is probably the same stuff as Halfords and all the other supermarket oils. I never had any problems with bearings or general wear although I made sure I changed it often.
The only time I had any bearing failure was when using a good quality semi synthetic in a "so called" professionally built race engine although that could have been down to bad workmanship and not oil but I will never know.
Now using Valvoline and so far I have had no trouble and that is after a seasons racing and I still get good oil pressure on tickover when the engine is hot.
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