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Originally Posted by rchase
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.
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See the thing is it's not in the back of my manual. My manual mentions nothing about oil, other then checking it and making sure its fine. The chart you're talking about I have seen in my wife's car's user manual, but that's for a jetta. So I found it strange that Mercedes would recommend a diesel oil which I have always used on my gasoline car versus the 10W40 version which is intended for gasoline car's. That part I find a little strange, as people at part shops in the past have questioned me using 15W40 in a gas powered car....