I'm teasing of course......

Buy the most expensive known brand, it must be betterer than all the others working to same spec sheet.
 
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Well I’ve gone and done it, bought a 20litres drum of the stuff, I figure the car was cheap so I’ll be the guinea pig and see what happens, worst case scenario is I sell it with a drive train fault, but fingers crossed it doesn’t cause any damage and works like a dream