rover v8 engine was never dseigned to run with 5/40 so recomend either unipart fuch oil 10/40 or 15/40 mineral
 
Guinness, you should NEVER run a freshly built engine on semi or fully synthetic oil. Use a good quality mineral oil at the specified grade for your engine. 10w 40 in your case.
Better still, buy a proper running in oil. Try fleabay, 5l for less than £20, but i think you'll need nearer 6l. Hope this helps, Dave.
 

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