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Sorry boys who love adnoc or enoc motor oil, they are cheap substitute to OEM motor oil. Don't fill people cars with non branded and non recommended motor oil. It's misleading and dangerous. If you support them, then ask them if any one car manufacturer recommended their formula is safe for their cars.....? That is one of the reason why big brands like castrol, liqui moly, shell, mobil1 etc print on every bottle recommended by Porsche, BMW, VW, Etc, because their blend and formula is certified and recommended by known car manufacturers.

Technically, it's not really a Mini, its an A3 1.8T with fibreglass panels but still, I like the idea.

The only thing I can agree with you on in this post is that diferent brands of oil should not be mixed. What is your reason for saying that synthetic oil will "not survive in that condition"? Fully synthetic oil is standard factory fill on many cars in some of the coldest countries on the planet. Moreover, saying that the OP should change to mineral oil because synthetic oil "vaporises" in some conditions is bad advice, since oil cannot "vaporise". It can only be burned if the engine is worn.