Noisy engine when cold starting, sometimes
 

Any common culprits that would cause a noisy cold engine? Sounds like lifters, goes away after a second or two once oil pressure builds. It doesn't always do it, either. I heard there were some o-rings and a check valve that might go bad. Would a bad tensioner also do this?

Dirty filter screens in the vanos are a distinct possibility...

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I was also going to mention Vanos system oil pressure

When my engine was cold it always ticked a bit while the lifters and chain tensioner primed, but what i noticed is it took a lot of time i was low on oil.

Where are the vanos filter screens?

N52, I'll look for the M54 and N62 in a bit. https://uploads.tapatalk-cdn.com/202...f6fd9026c4.jpg

https://uploads.tapatalk-cdn.com/202...c4a68d60cc.jpg

I believe the M54 (no personal experience) have a non-replaceable permanent screen. https://uploads.tapatalk-cdn.com/202...894dcc2e7b.jpg

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There are some times that there is too much clearance in the thrust brgs for the vanos and there is a kit available to fix it, I haven't had this happen (I don't think) and don't know how similar the sound would be but you could maybe find an example on you-tube. If it's only for a second or 2 I wouldn't worry about it much other than it might be nice just to know what it is.

My M54s both used to lifer tick pretty obvious for about two seconds when cold starting.

When my oil got low, that would last 5-6 seconds.

If this is what's happening i believe is normal.

I checked the oil and it was a bit low, added maybe a quart. Noise went away for now? Seems to have done the trick although I don't really understand it.

Mine did the same thing until I added some Liqui Moly MOSO4. Still ticks if I let sit a few days without starting it.

It's pretty harmless to have the "lifters" tap a little while oil pressure fills them up.

The check valves hold oil in the head which helps a bunch but longer wait between starts will cause more tick of course

It will only usually present on a cold start. In my car with m54 motor, my oil level sender was broken so i never got a low oil warning. 5-6 second tick at cold start was my warning.

The lifters are filled with oil pressure. When oil is low it makes a little less oil pressure and takes longer to build so the lifter tick lasts a while when cold engine.

It's mostly harmless. Engine is not under load.

Is this even after you used 5w-40 Castrol Euro oil (IIRC, you're using it, same as me)?

Also, do you mean LM MOS02, not 04 (which I can't find listed in their product line)?

My engine presently doesn't have much of a tick at all, but at 212k miles, it sure couldn't hurt to have that additive ready to add at my next oil change.




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LM MOS02, yes, I'm running Castrol 5/40 A3/B4. Keyboard has sticky keys today. :bustingup

I just did an oil change. I can tell the difference between a 5k mile and fresh oil engine sound. The M54 responds so well to fresh oil.

It's more to with fact you are adding some fresh oil which helps rather than the level being down a bit.