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Old 01-16-2003, 11:12 PM
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1986 300E driveline thrumming:resolution

Some time back I reported a steady, pulsing, thrumming which I felt in the steering wheel of my 86, 300E from about 45 to 55 MPH. The other day, after returning from the city, the red, oil warning light came on, I checked the oil level and it was down 1 1/2 litres(quarts to U.S. friends). Due to being busy I had not added any oil for 3,500 miles and it was down, alright. After adding the oil and driving back onto the highway, I noticed that the thrumming had disappeared and has not reappeared. Question: Could that have been due to the trochoid pump and that the engine oil level was a bit too low? If not, then I am baffled--still! All other checks came up ok!

Al Hardy on Vancouver Island
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Old 01-20-2003, 05:25 PM
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Join Date: Dec 2002
Location: Columbus, OH
Posts: 19
a....don't know too much about 300e yet, but being 1 1/2 quarts low on oil will have a negative effect on any car over a period of time and may or may not cause any kind of noise to react to.
87 300e
Got a great deal on this car
I think?
5/5/03 Hit and run victim. Someone back into my car while I was in the back. Need a grill and grill trim.
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Old 01-21-2003, 01:51 AM
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Join Date: May 1999
Location: Sacramento, CA
Posts: 1,472
My guess would be that the oil level didn't have much to do with your vibration problem... It's a quart and a half (or so, maybe a quart) before the low oil light comes on, and two quarts between the min and max levels on the dipstick. It will run fine when it's down a quart or two. I've heard the engine will even be okay with less oil than that, but DON'T take my word for it...

Incidentally, your thrumming problem sounds like a wheel balance issue. I had some significant vibration through my steering wheel for awhile, and a tire rotate + 4 wheel balance made it seriously better (though not entirely smooth).

Also, my low oil light is yellow. Are the Canada cars different?

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