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Originally Posted by trueog
Hey guys, I have a question that not even the dealer could give me an answer for, just simply put they said use 15W40.
Now what do you guys think is a better choice to use on a 94 C220?
10W40 or 15W40?
Now 15W40 Castrol say's, Diesel oil on it while on the back it says it meets Mercedes standards. Mean while 10W40 costs a few dollars more, yet fails to mention any mercedes standards it meets, yet it drops the "diesel oil" label. So my question is, isn't 10W40 better for the car? How do these oils line up, the pro's and con's againest each other? which ones a better choice strictly for mercedes?
I want to get an answer on this one.
THanks
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Neither one is "better" than the other. The different weight oils are designed for different tempature ranges and different engine requirements. Some cars need heavy oils and some need thinner ones. Also different envorimental issues may affect which oil you should use. You would not use the same oil for a car that spends most of its life in Minnesota as you would that spends its life in Miami.
If you look in the back of the Mercedes Manual for your car you will notice that all of the approved oils for your engine are listed. It will also show a tempature range that the oils are good for. The best oil will be the oil that best fits the tempatures that you might see in your paticular climate.
I use Mobil 1 in my car with a weight that varies depending on the season. I use the chart in my manual to determine the weight.