engine oil help

Avatardeleted21323326
Posted 28th Jan 2010
my dad has put 15w40 oil in my car but just checked my manual and it says to put in 10w40 does it really make a difference. i havent got a clue
my next door neighbour said i would have to drain all the oil out and put the right one in, dont know if he taking the mick tho
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