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				oil top up
			 
 
			i have a 986 and i usually use bp fully synthetic oil 0w40.now i need to top up about 1/2 a litre, but i cant seem to find any of the oil i usually use anywhere, everyone is telling me that its out of stock.
 can i add up with another brand, given that its got the same viscosity, will i do any harm to the engine?
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