Agree with the poster above, this needs a complete new, fully warranted replacement engine, or a rejection / refund.
If piston slap has developed, it means the cylinder bores have worn unevenly and prematurely, or the piston skirts are already worn, or both. In any case, there's a very real risk that metal fragments are in the cylinder head oilways etc, which could cause further problems in the future.
A short engine replacement is what you might consider on an older 3rd hand car that you're running on a budget, NOT on a nearly-new Mazda.
Edited by craig-pd130 on 21/03/2011 at 12:00
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