I dont think its actually the workers from these countries that are at fault rather the assembly plant trying to get said product built as cheaply as possible ,(materials).To put all the engineering that goes into a car ,inluding its servicable parts like filters , brakes ,etc....A Then durability testing of these parts as a whole Working car of loads and suspention durability puts a light on what wealth of knowledge each part has in it when factory OEM,the rub is their stamping it mercedes .Flip that to an overseas supplier who uses A cheaper grade of rubber ,steel ,or wiring to complete the same task,this gives you a good view of what is the true answer to what questions you may have to product quality.The fight maybe to get a few owners and email it along to corporate in German .Nothing like asking an engineer the same question 10,000 TIMES of how these parts equal up to their standards and THEN wear their brand.Get that email and then something can take shape.