we had the biggest mahle tennex factory in europe until they moved lock stock and barrel to some cheapo country recently just outside of salisbury where i live ,i believe they had a good reputation....but you cannot beat wiseco even if there a bit more expensive they are worth it ,you can get more hours out of them and ive never had a problem i always use them over stock items (apart from the factory pistons on my jan de groot motor) perhaps its cheaper and safer in the long run getting more life out of one