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  #1  
Old 05-05-2002, 11:17 PM
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Join Date: Oct 2001
Location: Canada
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Lightbulb Used oil analysis: Ford vs. Mercedes

Today I changed oil for my 92 400E, I then compared the old engine oil to the oil from my 96 Ford Explorer, see picture below (thanks to my new Mini-DV).

They are both Mobil-1 5W30, they both have stayed 6 months in the engine, 4800 km in Mercedes 6600 km in Ford.

My Ford is a 4.0 pushrod V6, it has nearly 140k km, it's noisy but extremely reliable. 92 400E has more than 210k km on it. The difference is Ford only holds 4 Liters oil while Mercedes needs 8 Liters.

Does the picture indicate I could extend oil change interval for my Benz? or just how crude Ford is when comparing with Mercedes?

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Used oil analysis: Ford vs. Mercedes-oil_comp_3.jpg  
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Old 05-05-2002, 11:33 PM
Diesel Power
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I would personally do the same little informal test between both vehicles with the same mileage on the oil for both vehicles. You left the oil in the Ford in for almost 2,000km longer, so I would expect the oil to be darker.
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  #3  
Old 05-06-2002, 11:52 AM
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Join Date: Jul 2001
Location: San Antone
Posts: 408
The only way to know for sure if your oil can handle extended drain intervals is to send a sample to a lab for analysis. The lab will provide a break-down of the oil's condition (additives, chemical composition, etc.) and what the oil contains (contaminates, metals, fluids, etc.). A search of the forum or web using search term "oil analysis" will locate several labs that can analyze your oil.

Good Luck!
Tom
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  #4  
Old 05-06-2002, 01:38 PM
Leon Hernandez
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I would follow through with the recommendation of the oil anaylsis. I use Amsoil oil analysis kit. M preference, you can as mentioned find one doing a search. We used OA program in the Army. I had a large motor pool and we had to change th eoil out maybe 4 or 5 times. This was mostly due to driver error....not securing the new airfilters..high silicia content. It will take more than one analysis to tell you how your engines are doing; the first will be your baseline. From then on you can trend metal particle content and judge your extended oil changes from there.

Color is not a manner of judging oil quality, nor is rubbing a tad fomr the dip stick between the fingers. Particles of 5-10 microns can still damage engines so if your into long care for your engines OA is the way to go......best regards..........LH

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