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		The correct oil for the engine, apparently fully synth makes the vvc mechanism fail on the mg so you have to stick with semi synth. Semi isn't bad anyway and can be cheaper
	
	
	
	
		
	
 
 
	
	
	
		
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		i believe its superposed to be 10-40 semi synthetic, didnt think that by putting a better quality oil in it would cause any damage??
	
	
	
	
		
	
 
 
	
	
	
		
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		just use 10w/40 semi. its no mega boosted machine...keep it simple
	
	
	
	
		
	
 
 
	
	
	
		
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		not always...old classics cant stand synth.
follow pugs recomendations
	
	
	
	
		
	
 
 
	
	
	
		
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		Ask in the Opie Oils thread?
	
	
	
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		so how i see it is, it has better cold protection over the 10-40 (lower first number 5 meaning better cold protection?) and being fully synthetic so better quality oil? 
Dont see how that can cause issues if im giving it better protection. 
Tbh first time i hurd this so i have no idea probably wrong but if i am next time its due will just put the 10-40 in its supposed to have.
	
	
	
	
		
	
 
 
	
	
	
		
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		No the lowest number at the beginning is the oil's cold viscosity (lower being thinner oil)
So on a cold engine your oil will be thinner, and on a slack old engine your thinner oil might not make decent pressure.
Why not stick in a thicker oil, which should increase the oil pressure on cold running.
	
	
	
	
		
	
 
 
	
	
	
		
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		Just stick any old shite in man, it'll be fiiiiiine
	
	
	
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		10w40 semi will be fine as there is no way youll be hurting the oil in a nad engine and the XUDs arent keen on synth (i know yours is TUD)
5w40 just means its a little thinner when cold (untill the engine is warm)