S54 engine -- dry sumped?

[carl]

I was looking through the manual today and it says the correct oil measuring procedure is to run the engine up to operating temperature, then let it stand for one minute and measure the oil via the dipstick. This sounds like the measurement procedure for a dry-sumped engine -- usually you measure a wet sump when it's been left standing for a while.

So, is the S54 engine wet or dry-sumped?

 

[carl]

Guess I should've checked Google first...


"High-performance lubrication and cooling

To help ensure adequate lubrication under the high cornering, acceleration and braking loads the Z4 M Roadster and Coupe attain, the S54 engine employs a “semi-dry-sump” oiling system. Particularly in hard cornering to the left, it is critical to ensure return of oil to the pan; therefore, integrated into the gear-type pressure pump is a scavenging pump that collects oil from the right side of the small forward oil sump and pumps it back into the main, larger rear sump. This rear sump is almost completely closed off from the rest of the system, and thus able to hold the oil necessary for lubrication throughout the engine. Specific return passages are also incorporated into the intake (left) side of the engine to help ensure ideal oil flow under all operating conditions. "

From http://www.zercustoms.com/news/2008-BMW ... Coupe.html

 

[Jas667]

Oh crap. I never even checked this. I always check my oil from a cold engine, oops. :headbang:

 

[Starscream]

Guess I should've checked Google first...


"High-performance lubrication and cooling

To help ensure adequate lubrication under the high cornering, acceleration and braking loads the Z4 M Roadster and Coupe attain, the S54 engine employs a “semi-dry-sump” oiling system. Particularly in hard cornering to the left, it is critical to ensure return of oil to the pan; therefore, integrated into the gear-type pressure pump is a scavenging pump that collects oil from the right side of the small forward oil sump and pumps it back into the main, larger rear sump. This rear sump is almost completely closed off from the rest of the system, and thus able to hold the oil necessary for lubrication throughout the engine. Specific return passages are also incorporated into the intake (left) side of the engine to help ensure ideal oil flow under all operating conditions. "

From http://www.zercustoms.com/news/2008-BMW ... Coupe.html

Good site with a lot of cool info on our cars