Motor Oil (100%Synthetic vs Synthetic Multiblend vs Non-Synthetic) for a 2002 CLK430
Back when these cars were under warranty, Mercedes-Benz required that a specific "type" of motor oil be used. That type had to meet the Mercedes-Benz 229.5 engine oil standard. When I last checked, there were over 150 different motor oils which met that standard. However, I don't know of any non-synthetic oil in that list. So in effect, "synthetic oil" was required if an owner wanted to keep their warranty intact. The same is true today, but Mercedes has a different engine oil standard for new vehicles.
Magnuson-moss states a "specific product", not a "product type". For example, diesel is a type of fuel. Gasoline is another type of fuel. If someone uses the wrong type of fuel, Mercedes-Benz will void their engine warranty.
Lastly Mercedes-Benz did provide oil free of charge for these cars when they were new. Maintenance such as oil changes and oil top offs were included during the warranty period (for the first 50,000 miles) for every Mercedes-Benz vehicle sold in the United States. That stopped some time after the W208 was discontinued.
Last edited by MarcusF; Jan 30, 2014 at 12:31 PM.
If I were you, I would immediately stop using conventional dino oil and use an "approved oil". Using any brand and/or weight of synthetic isn't a solution. An "approved oil" is a solution. The wrong oil is a lot like smoking. Some people smoke and never develop lung cancer while others aren't so fortunate. On the flip side, I've never heard anyone say, "Mobil 1 0-40 Euro shortened the engine life of my Mercedes".
If I remember correctly, the rumor was conventional oil caused seals (like the rear main rope seals that were so popular) to swell. Changing to synthetics allegedly caused the seals to shrink to their original size. Allegedly, none of that happens any longer because synthetic oil and seals have improved. At the time I remember thinking the rumor was, er . . . bovine excrement, because if conventional oil caused the seals to swell, then the engines rebuilt should have initially leaked. Now, engines may have leaked for other reasons, but I couldn't wrap my head around the seal issue as it was explained to me.
Flashing forward to today, I don't see any issues with using synthetic oil after prolonged dino oil use. If you go with synthetic and your car immediately starts leaking like the Exxon Valdez, post back. Thanks
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