In applications I use synthetic I have switched to the delo 15w40 at Walmart 
which is cheaper than M1 and most likely is the same. I believe the Delo might 
be MB approved. For the 112 and 113 powered cars I still use M1 0w40 with is MB 
approved for those applications. 

Sent from my iPhone

> On Aug 8, 2017, at 4:17 PM, Randy Bennell via Mercedes 
> <> wrote:
>> On 08/08/2017 3:35 PM, OK Don via Mercedes wrote:
>> There's a Youtube video out there that claims that after the law suit that
>> resulted in partially synthetic oils could be marketed as "synthetic", all
>> but one of the companies stopped making/selling true synthetic oil. I
>> believe that Herr Booth was correct, at the time, that M1 was far superior
>> and resulted in less wear, etc. However, the oils available to us today are
>> the same as they were then. The results of that Blackstone Labs study has
>> convinced me that there is virtually no difference in the oils we can buy
>> today, so go cheap.
> For what it is worth, I will throw my 2 cents in . . .
> I suspect that the primary advantage of synthetics is in either very hot or 
> very cold weather.
> Here in the great white north, we get a lot of pretty cold weather.
> I believe we were led to believe that the oil would flow much better in the 
> cold and provide more immediate protection to things like the bearings if we 
> use synthetic oils.
> I wonder what difference one might see if one were to put a gallon of the 
> dino oil and a gallon of the synthetic oil in a freezer for a day or two and 
> then pour them out.
> I remember pouring out a jug of dino oil in cold weather and saw a big lump 
> of some sort that looked like there was a can of the old STP in the jug. Not 
> sure if the cold caused it to separate from the other ingredients but that 
> was my thought at the time. Do the modern oils avoid that sort of thing? Do 
> the synthetics do it better?
> The jug that I was pouring was likely 10W30. These days we are using 5W20 so 
> much thinner to begin with.
> I have been running M1 for the last 15 years or more in my trucks and my 
> wife's car but have never switched the old diesel to it as I have trouble 
> finding the right grade around here. I only drive it in the summer and it 
> gets few miles so I have never worried about it. Should I? Hard to say. I 
> started out using Rotella and have switched to Delo.
> Am I wasting my money on the synthetic oils for the other vehicles? Hard to 
> say.
> I have been a believer in changing oil and filter at very regular intervals - 
> about 3000 miles when I was running dino. More like 4K to 5K with the 
> synthetics. I had an 86 Taurus engine apart at over 100K miles due to a bad 
> head gasket and the inside looked like new and it never had synthetic oil.
> I guess I have to think that any oil is better than no oil and clean oil is 
> better than expensive dirty oil.
> However, engines have become expensive and complex and I sort of think of the 
> synthetic as being more insurance against an expensive failure. My truck is a 
> 2013 F150 with the 5 litre coyote engine. It only has about 39K miles on it. 
> My wife's car is a 2007 Honda Accord with about 70K miles (if my memory is 
> correct). We are not putting huge miles on so I only change the oil in either 
> of them about 2X each year. Dino oil might be fine but the cost difference is 
> minimal so I will likely carry on with the M1 in both of them.
> RB
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