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      06-10-2010, 07:16 AM   #1
Evice
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Interesting Read about N52 Lifter issue

http://baltimore-bimmer.com/2010/02/n52-lifter-noise/

sorry if it is a repost. I didn't do a search.

Edit: apparently this guys doesn't know what he is talking about, please read below comments.
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      06-10-2010, 07:41 AM   #2
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Uh, I'm not a mechanic or anything, but I don't agree with the central point of the article: "Upon your first oil change the oil filter housing is opened for the first time since your BMW was built at the factory. The oil filter design like most of the earlier BMW’s is upside down on top of the engine. Much like a glass in the sink when doing the dishes, if you hold the glass upside down you can pull and hold the water inside the glass even if it is above the water line as long as the open end of the glass remains under the water. If you allow air in the oil filter housing the hydraulic principal is the same. You have allowed air into your oil circuit. " If this were true, then the oil filter housing would be full to the brim with oil when you open it that first time. That's not the case. The oil system doesn't operate by maintaining a sealed vacuum.
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      06-10-2010, 09:29 AM   #3
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I see where you are getting at.. May be it is not full with with because you open the drain plug 1st and actually it lets the oil pressure change and start draining? (I never changed my oil myself, I dunno which ones is done 1st)
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      06-10-2010, 10:13 AM   #4
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I trust TrackRat on this.. I will keep the post so people can learn to dodge it
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      06-10-2010, 12:01 PM   #5
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The article also says "High engine rpm’s = high oil pressure = thicker pillow between moving parts = Longer lasting engine."

There are a few little things like centifugal force and the oil pressure regulator valve that complicate the above statement. Sounds a little clueless to me.
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      06-10-2010, 08:44 PM   #6
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I'm not a mechanic, but I am an engineer.......I would totally avoid this dealership. This guy is a complete idiot.
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      06-11-2010, 06:33 AM   #7
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It is good that it is his personal blog
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      06-11-2010, 11:52 AM   #8
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The OP does display an huge lack of logic. I have changed a lot of oil although I am an amateur. I am also a mechanical engineer but I do not work in the automotive field. We do oil change days at my church every quarter for ladies who need a little help. So in addition to my own I do 5-10 random cars a quarter (no BMWs yet but we have done a few pretty nice cars). We routinely fill oil filters with oil if they are oriented such that we can without making a mess (i.e. if they are vertically oriented with the flange up). We do that to get oil pressure a fraction of a second quicker when the engine is started. Air is not a factor for the reasons already cited. It goes away nearly instantly and does not impede getting oil pressure.

All modern cars have a valve in the engine or oil filter to keep oil in the filter when it is not running. It must be part of the oil filter housing on my bimmer because the filter is just a paper cartridge. On a more typical oil filter, this valve is little plastic flap you see on the flange.

In terms of driving hard, you need to get the oil temperature up to normal operating levels before driving hard. This is because the oil has too high viscosity until it reaches normal operating temperature for the flow to be what it needs to be. Pressure will be up in less than a second but it will actually be too high because the viscosity is too high. What you want is full flow to the bearings before you run hard. That means let it warm up first. Manufacturers recomment 0 or 5W as the cold oil viscosity for the same reason - get full flow ASAP.

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