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E46 M3 (2001-2006) Engine: S54 - Max Hp: 333 hp at 7,900 rpm / 262 lb/ft at 4,900 rpm
Total Produced: 45,000+ - Years Produced: 2001 to 2006.


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Old Sun, Nov-10-2019, 11:55:39 PM   #1
icecream
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Default Oil a little milky

I bought a used engine from craigslist last week. I popped it open today and the very last bit of oil coming out was a little milky. F*** me right? He wrote me a receipt that it was a good working engine. Anyway this is just condesation from sitting? Guess its time for a compression test.
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Old Mon, Nov-11-2019, 12:00:14 AM   #2
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Default Re: Oil a little milky

I left my car out in the rain for a day without a hood on or the intake tubing ( just the plenum ), oil was a milkshake after that. Glad I checked it lol. Head gasket could be gone but I bet itís condensation.


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Old Mon, Nov-11-2019, 12:23:09 AM   #3
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Default Re: Oil a little milky

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Originally Posted by Pirelli Condoms View Post
I left my car out in the rain for a day without a hood on or the intake tubing ( just the plenum ), oil was a milkshake after that. Glad I checked it lol. Head gasket could be gone but I bet itís condensation.


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Yeah ; I am hoping that is the case. The milky ness was primarily coming out of the valve cover return line to pan. Inside the pan there was some that was milky too from the last bit but the internals and rod bearing area look ok.
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Old Mon, Nov-11-2019, 12:29:51 AM   #4
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Default Re: Oil a little milky

Leak down test is pretty easy to do and will give you piece of mind.

If everything checks out Iíd run the engine with fresh oil for a couple hundred miles then change it.
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Old Mon, Nov-11-2019, 06:02:01 PM   #5
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Default Re: Oil a little milky

That's a tough call, as you don't know if it was due to sitting or another issue that could of affected the bearing life. So you pulled the rod bearings and they look ok?
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Old Mon, Nov-11-2019, 07:42:42 PM   #6
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Default Re: Oil a little milky

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That's a tough call, as you don't know if it was due to sitting or another issue that could of affected the bearing life. So you pulled the rod bearings and they look ok?
I changed the bearings last night. They actually looked worse than my old engine even though they had 175k on them. This motor only had 110k on it. Only my #5 bearing spun, not sure why since the others didnt even show copper.
Anyway, The oil looked very clean otherwise until I got to the last bit. I am also certain it was not 10w60, way thin, I took a sample for blackstone maybe. Internals were clean, crank was perfect.
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Old Mon, Nov-11-2019, 09:51:54 PM   #7
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Default Re: Oil a little milky

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Originally Posted by icecream View Post
I changed the bearings last night. They actually looked worse than my old engine even though they had 175k on them. This motor only had 110k on it. Only my #5 bearing spun, not sure why since the others didnt even show copper.
Anyway, The oil looked very clean otherwise until I got to the last bit. I am also certain it was not 10w60, way thin, I took a sample for blackstone maybe. Internals were clean, crank was perfect.
So I've had 911's (air-cooled), with milky oil/foam in the neck and cap area of the oil tank, and oil was excellent in the engine and in the oil tank itself, due to moisture entering the tank from the breather/vent hose. Looks like yours is something similar. Maybe do a couple of short length oil changes then just monitor.
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Discussing Oil a little milky in the E46 M3 (2001-2006) Forum - Engine: S54 - Max Hp: 333 hp at 7,900 rpm / 262 lb/ft at 4,900 rpm
Total Produced: 45,000+ - Years Produced: 2001 to 2006. at BMW M3 Forum.com (E30 M3 | E36 M3 | E46 M3 | E92 M3 | F80/X)