what does the owners manual say, read it, thats what its for, whats the reg plate, cus if you sell it, im not interested because you will be doing the life of the engine no favours in blowing it to bits out of the box. Just because it may or maynot go bang and drop its oil on the deck, doesnt mean its ok and will last, cus it wont. You need to tell your mum not to do, trust me, when some of our expects read this thread, brace yourself for some harsh words!!. YOU HAVE BEEN WARNED! . do ruin a cracking car, just for the sake of 1000 miles careful driving.