See attached.
After analysis #2 (posted earlier) indicated the oil had diluted to an SAE 20 viscosity I had to change it. (MB must have factory filled with an SAE 30 viscosity in order to get better MPG numbers.)
Analysis #3 was immediately after the sump only (no filter) was changed and run to mix everything up, hence the 0.6% dilution number.
Analysis #4 was after one week of typical use, i.e. short trip commuting.
Analysis #5 was after an additional week of typical use.
Analysis #6 was after an additional two weeks of typical use. Here are the lab's comments after this analysis:
Check for source of FUEL LEAK. Fuel is at a SIGNIFICANT LEVEL. Fuel dilution may be caused by component faults related to injectors, ignition/timing or excessive blow-by. Additional causes include heavy throttle application, engine lugging, frequent short trips, and excessive idling. LUBRICANT and FILTER CHANGE is suggested if not done at sampling time. FUEL DILUTION has caused viscosity to decrease moderately; FUEL DILUTION reduces the viscosity of the lubricant which decreases FILM STRENGTH and LUBRICITY and may lead to increased wear. Resample at half interval; Your note was taken into consideration. (Emphasis in original.)
Analysis #7 was the day after #6 immediately following a 100 mile each way road trip. Only marginal improvement on the fuel dilution, surely to be followed by additional dilution with more typical use.
Needless to say, I am not a happy camper. By my estimates, after only five or six weeks of typical use the fuel dilution will be over 5%, the widely accepted critical level. I do not feel as though the car should have to be driven fifty miles every time it is cranked up just to avoid this problem. MB should be ashamed to engineer and market such a bomb.
I did my research before buying this thing and couldn't find a shred of evidence that the problem existed. So why doesn't anyone care about this issue? If your typical use is short-trip driving I would bet it is happening to your engine as well. Maybe folks do not care because they are in a lease. Now I wish I were. Maybe they are otherwise in it for the short term. I probably will be given this situation. Maybe they have so much money they just do not care. Must be nice. Or then maybe they are just a fanboy/sycophant. If so, they better wake up.
After analysis #2 (posted earlier) indicated the oil had diluted to an SAE 20 viscosity I had to change it. (MB must have factory filled with an SAE 30 viscosity in order to get better MPG numbers.)
Analysis #3 was immediately after the sump only (no filter) was changed and run to mix everything up, hence the 0.6% dilution number.
Analysis #4 was after one week of typical use, i.e. short trip commuting.
Analysis #5 was after an additional week of typical use.
Analysis #6 was after an additional two weeks of typical use. Here are the lab's comments after this analysis:
Check for source of FUEL LEAK. Fuel is at a SIGNIFICANT LEVEL. Fuel dilution may be caused by component faults related to injectors, ignition/timing or excessive blow-by. Additional causes include heavy throttle application, engine lugging, frequent short trips, and excessive idling. LUBRICANT and FILTER CHANGE is suggested if not done at sampling time. FUEL DILUTION has caused viscosity to decrease moderately; FUEL DILUTION reduces the viscosity of the lubricant which decreases FILM STRENGTH and LUBRICITY and may lead to increased wear. Resample at half interval; Your note was taken into consideration. (Emphasis in original.)
Analysis #7 was the day after #6 immediately following a 100 mile each way road trip. Only marginal improvement on the fuel dilution, surely to be followed by additional dilution with more typical use.
Needless to say, I am not a happy camper. By my estimates, after only five or six weeks of typical use the fuel dilution will be over 5%, the widely accepted critical level. I do not feel as though the car should have to be driven fifty miles every time it is cranked up just to avoid this problem. MB should be ashamed to engineer and market such a bomb.
I did my research before buying this thing and couldn't find a shred of evidence that the problem existed. So why doesn't anyone care about this issue? If your typical use is short-trip driving I would bet it is happening to your engine as well. Maybe folks do not care because they are in a lease. Now I wish I were. Maybe they are otherwise in it for the short term. I probably will be given this situation. Maybe they have so much money they just do not care. Must be nice. Or then maybe they are just a fanboy/sycophant. If so, they better wake up.
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