Saw on cap you weren't supposed to overfill oil, mines a little high...

Whats the danger?

Frothy oil doesnt pump nor lubricate properly.

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Terry Allison
N. Calif. & Boca Chica, Panama

09' E320 Bluetec 77k (USA)
09' Hyundai Santa Fe Diesel 48k (S.A.)

Oil foaming, the crank/rods sloshing in liquid oil.

Drain some out until its half way between the two marks with the engine warm.

How much is a little? 1/8"? I prolly wouldnt worry about 1/8" or so, but more than that.....

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1984 123.193 372,xxx miles, room for Seven.

1999 Dodge Durango Cummins 4BTAA 47RE 5k lb 4x4 getting 25+mpgs, room for Seven.

air in the oil can cause cavitation in the oil pump and send foam through the bearing causing lack of lubrication.

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Have you ever noticed that anybody driving slower than you is an idiot, and anyone going faster than you is a maniac?

As long as they would add one additional commandment for you to keep thy religion to thyself.
George Carlin (Wonder where he is now..)

1981 240d (engine donor 1983 240d) recently rebuilt engine hurray! - No more.. fought a tree and the tree won.

pearl black 1983 240d 4speed (Converted!@$$%) atleast the tranny was rebuilt.

Drained some out and made sure its right in the middle of the lines..... Figure its best to be safe then sorry a few minutes now and some really dirty hands is better then a bummed car down the road

Another issue is that higher oil level will cause increased pressure in the crankcase due to a decreased volume of air. This can create havoc on the front and rear main seals and cause them to leak.

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'83 300D 198,000mi Howard
'03 Saturn Vue CVT 75,000mi(wifeys)

Overfilling can also lead to an engine runaway condition.

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RRGrassi


70's Southern Pacific #5608 Fairmont A-4 MOW car

13 VW JSW 2.0 TDI 193K, Tuned with DPF and EGR Delete.

91 W124 300D Turbo replaced, Pressure W/G actuator installed. 210K

90 Dodge D250 5.9 Cummins/5 speed. 400K

Funny, my 1993 4L (v6) Ford ranger ran exceptionally better when 1 quart high....

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$60 OM617 Blank Exhaust Flanges
$110 OM606 Blank Exhaust Flanges
No merc at the moment

Halfway between the two marks? Is that where it is at with the full 8 qts or whatever the capacity is? I thought it should be near the top mark.

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The marks are the operating range, not empty/full.

Consider the "halfway" mark a safety zone.... when the oil heats up like everything else it expands and it will bring the oil level up.

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1980 300SD

Between the two marks is the "safe" range. Lower mark being minimum safe oil level and the upper mark being maximum.

The crankcase hold 7.9 quarts on the OM617.9xx. Since we do not buy our oil in liters, 8 quarts, or two gallons puts the oil level a hair above the upper mark.

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RRGrassi


70's Southern Pacific #5608 Fairmont A-4 MOW car

13 VW JSW 2.0 TDI 193K, Tuned with DPF and EGR Delete.

91 W124 300D Turbo replaced, Pressure W/G actuator installed. 210K

90 Dodge D250 5.9 Cummins/5 speed. 400K

Makes sense... I guess I am just wondering where it shows up when you have done an oil change, drained all the oil out, and then added a fresh 8qts.

edit: nevermind, I see someone answered my question while I was typing this. Thanks.

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it is mostly caused by restricted air passages for blowby to vent. Oil sloshing around, going down a steep hill, pressure builds, pops or deforms a seal.. perhaps valve stem seals as well.

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