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  #1  
Old 06-09-2006, 06:17 PM
fantom71's Avatar
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Join Date: Jan 2006
Location: Madison, AL
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Oil light on intermittently

I have a perplexing situtation...

When it is getting close to time for an oil change, my oil light will come on for a few seconds then go back off soon after start up. The first time this happened, I cut the engine, checked everything. No problems found. I babied it home let it cool down and checked the oil. The level was where it should be, directly in the middle of the red tabs. I changed the oil, everything was OK until about 200-300 miles due to the next oil change and the same thing happened. The oil pressure has always registered 1.5-2 kpa idle and pegged at 3 when at speed. Is this some clever way to "remind" me that I am getting close to an oil change?
Seriously, this light thing worries me. I have been constantly told that the oil light is the most important thing to watch on the instrument cluster and I do not want to start ignoring it...

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Old 06-09-2006, 07:02 PM
dieseldiehard's Avatar
Dieseldiehard
 
Join Date: Oct 2002
Location: Bay Area No Calif.
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Quote:
Originally Posted by fantom71
I have a perplexing situtation...

When it is getting close to time for an oil change, my oil light will come on for a few seconds then go back off soon after start up. The first time this happened, I cut the engine, checked everything. No problems found. I babied it home let it cool down and checked the oil. The level was where it should be, directly in the middle of the red tabs. I changed the oil, everything was OK until about 200-300 miles due to the next oil change and the same thing happened. The oil pressure has always registered 1.5-2 kpa idle and pegged at 3 when at speed. Is this some clever way to "remind" me that I am getting close to an oil change?
Seriously, this light thing worries me. I have been constantly told that the oil light is the most important thing to watch on the instrument cluster and I do not want to start ignoring it...
Its possible that your level is getting near the low mark that is all. If its near 3000 miles that you come to use oil down to the add mark, I'd live with it and consider it a nice feature!

I know little about the Euro 603 but have to assume it uses the same oil level sensor the US 603 turbos have, its located on the side (left?) of the sump and has a float that senses the level of oil. I recall that there was a update from MB that changed the memory time in a module that drives the lamp on the dash, to lengthen the time it holds the signal before flashing the lamp.

If you are inclined to investigate the float you could remove it to see that its still free and not binding, how it works is that since the float tends to bob up and down as you turn corners (because the level of oil changes considerably as it sloshees around) it has some hysterisis built in to the detector module to account for that otherwise the lamp on the instrument cluster would be flashing a lot.

As long as the level is correct you may have to just live with it or find the factory update module (=expensive!).
A hint is not to fill oil all way to the full mark on the dip stick on the 603 engine as it has been noted that oil consumption is greater when you fill to the top mark. I keep mine around the half way mark on a level surface. The oil level must be check on a perfectly level surface, even a small grade will throw it off.
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Old 06-09-2006, 10:20 PM
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Join Date: Nov 2002
Location: Milford, CT
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Sounds like a bad sensor. Either ignore it or replace the sensor during the next oil change.

I am sure in the FSM their is some way to test it, I found out how to test the washer fluid light once, forgot how though.

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