Following taking my car to a mechanic for an unrelated, minor, problem at the weekend, it was discovered that it has a cracked turbo manifold. Having only bought the car a fortnight ago I returned to the dealer it was bought from and after a bit of to-ing and fro-ing about his obligations under the Sale of Goods Act, he agreed to resolve the issue.
The mechanic had already advised that there are two ways to deal with a cracked manifold: the first is to replace it entirely, at a cost of about £600 for parts and labour; the second is simply to weld the crack, but the mechanic advised that this method is frequently unsuccessful and he sees a number of vehicles where the issue just resurfaces after a few months because the weld doesn't hold properly. (It's of no interest to him to favour the more expensive option as he won't be getting the work either way, the dealer will have their own garage sort it).
The dealer has indicated that (of course, because it's much cheaper) his preferred option is to weld it. I'm not entirely happy with this, as I really don't want to be in the same position 6 months down the line with the crack resurfacing but fewer rights to have the dealer resolve it.
So my question is - do I have any right to reject a repair method under the Sale of Goods Act and insist on a different option?