C-Class (W203) 2001-2007, C160, C180, C200, C220, C230, C240, C270, C280, C300, C320, C230K, C350, Coupe

2003 C240

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Old Jul 10, 2011 | 09:02 AM
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96 c220, 97 s320 & 03 c240
2003 C240

is it normal to get a little smoke from the valve cover when you open the oil fill cap?
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Old Jul 10, 2011 | 03:04 PM
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phister's Avatar
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From: fort worth, tx
06 C230 SS 6spd
are you doing this after the engine has been running for awhile?
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Old Jul 10, 2011 | 05:04 PM
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late 2009 CLK 350 Coupe Elegance, '65 Jaguar S Type wires
Yes!
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Old Jul 11, 2011 | 05:46 PM
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96 c220, 97 s320 & 03 c240
yes. but i also see sludge on the cap also. what do you think?
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Old Jul 11, 2011 | 07:00 PM
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From: Llandudno, Cape Town, South Africa
late 2009 CLK 350 Coupe Elegance, '65 Jaguar S Type wires
Is the sludge like mayonnaise or dark?

If like mayonnaise you might have a blown gasket & coolant leak.

If dark the car might not have been regularely serviced with the correect Benz approved 229.5 oils.

Change oil every 5000 miles until the sludge has cleared.
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Old Jul 11, 2011 | 07:32 PM
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2003 c240 4matic wagon
if its cold outside and i do short trips i get the yellow sludge/goo on the oil cap

NEVER get it in the warmers months thru
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Old Jul 11, 2011 | 10:00 PM
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96 c220, 97 s320 & 03 c240
its dark i will make sure the oil is changed every 5k, thanks
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Old Jul 12, 2011 | 08:02 AM
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From: Llandudno, Cape Town, South Africa
late 2009 CLK 350 Coupe Elegance, '65 Jaguar S Type wires
Originally Posted by contact148
if its cold outside and i do short trips i get the yellow sludge/goo on the oil cap

NEVER get it in the warmers months thru
Yes - in very cold conditions it is water from the combustion process getting past the rings. Made worse by short trips with the engine never getting hot enough to evapourate it all off.

In dyno testing over repeated 20Km's from a cold start I've got water in oil content up to 7%.
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