My good God, he's retarded!
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Multi weight oil is a particular weight oil that flows like another weight oil at zero degrees. For example-
5w30 is 5 weight oil that flows like 30 weight oil at zero degrees.
10w30 is 10 weight oil that flows like 30 weight oil at zero degrees and so on. The higher number comes from the time required to pour out a given amount at zero degrees. Therefore a 30 weight oil is thinner than a 40 weight because the container empties faster when cold (because it is thinner).
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"Euro Spec" for engines is Pentosin 5w40. They also have their own mineral based hydraulic fluid for brakes and clutches designated by cap color (red, green and blue) phosphate free engine coolant in two colors (blue and red) and a synthetic ATF. With Pentosin the color on the cap or the color of the fluid (or both) generally matches the cap of the reservoir it's going into. There is no substitute for these products no matter what the bottle says. Will something else work? Maybe. Will it last? It's your Mercedes.
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Mobil1 is one of the few oils that meets the new GM "DEXOS" spec and only in the 5w30 variety. All the other weights and brands failed. A few of the other brands that claim DEXOS compliance are likely repackaged Mobil1 or GM oil.
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NO oil from any major manufacturer has zinc in it any longer so any marine, antique or street rod (or anything with a flat tappet cam including new V8 Jeeps) application must have zinc additive to survive long. Gibbs racing and a few others have some zinc blended oil but it is expensive and hard to find. Zinc is an extreme pressure (EP) additive and does the lubricating under extreme loads like where cam meets lifter. It will not "squish" out so it is good for high load bearing surfaces and extreme heat.
