Thanks for the answer! This is the first time we've been met with a car that recommends a variety of oils. We've only owned Chevy, Jeep, and Toyota in the past and they all have a pre-set oil viscosity they want irregardless of your climate.

I'm in New England USA which means its fairly moderate. Warm summers, chilly winters but rarely anything into the extremes.

Our cars mostly run 5W-30 which is why I was hoping we could get away with using that if it is a direct place in.

I'm thinking of using the Mobil 1 European Formula https://www.amazon.com/Mobil-120760-Synthetic-Motor-0W-40/dp/B00HG76A9A/ref=sr_1_1?ie=UTF8&qid=1478619568&sr=8-1&keywords=mobil+1+european+car+formula+0w-40

http://www.mercedesmedic.com/how-to-change-oil-mercedes-benz-diy-instructions-video/

Because that website recommended it. But I see it nowhere listed on the MB 229.5 page. Only general Mobil1 shows up there Thanks!

Edit: Got the Castrol 0W-40 :) all good