Mercedes has premium marketing image. Often though it's anything but. I remember they got outed 2 years ago for using the same diesel engine in a "premium car" as the Renault Sandero.
Just because it's pretty, doesn't mean it's good. Do your research. The OP certainly has a valid question.
LMFAO ahhh the condescending "Do your research" spew! You do know Renault have ownership in Daimler right (through Renault-Nissan)? Nearly all auto makers, especially in these setups, have engines (and parts) from these sub companies. As it stands, a Mercedes will have Renault AND Nissan components, including shared engines or engine components, and Renaults, and Nissans, are getting Mercedes more powerful engines.
VW had a similar partnership with Suzuki a few years ago, especially to benefit these small engines they are currently rolling out as standard.
BMW has partnered with Toyota to build certain models and share technology and components.
If you want to get technical to this point, to prove Mercedes are NOT a premium brand (Premium Marketing quote), you do know most of the components even in your beloved VW are made by a brand that would never be considered upmarket, and you could find even in a lower tier Toyota? "Lower end" OEM brands, be it shocks from ZF Sachs or Monroe (who supply "entry level" BMW, Audi & Mercedes), bulbs and plugs from Bosch etc etc. They slap a different logo on them and call it "proudly made by [insert your car maker here]".
Audi has practically the same components shared across the VAG group of companies, be it Volksie, Skoda, SEAT etc. Does it mean the "premium marketed" Audi is really not premium or has the quality? Even VW is now an overpriced vehicle, with most not even sold with any sort of Maintenance or Service Plan as standard, while their "unreliable" competitors like Peugeot do.
Mercedes-Benz has quality & reliability issues, so does Toyota, Mitsubishi, GM subsidiary vehicles, BMW... Need I go on? Auto makers have been having these for quite a few years now due to cost cutting and increasing production, that's why we tend to have HUGE recalls every few years across these brands, be it a messed up starter, or catastrophic brakes. So how about you do YOUR research next time you say they were CAUGHT out.
It was a publicly announced partnership with Mercedes saying their smaller engines will be manufactured by Renault . They just launched the C160 in EU, guess what engine that could be? SUPRISE!
The heritage, design, build quality & after sales service alone on a Mercedes, is certainly no "premium marketing".