What I can remember after decades of working with BMW motorcycles
deep oil pans
BMW /2 motorcycle deep oil pan
By Duane Ausherman
This page is about the deep oil pan for the /2, but most of it applies to the /5 and later bikes. Several types of accessory oil pan products have been offered. I think that I have seen, or heard about, at least 6 types of accessory pan for the BMW motorcycle. One had deeper fins for more cooling and was cast out of aluminum. The idea was to improve the cooling of the existing quantity of oil, not increase the air volume.
Another type was a spacer. It used the stock oil pan as the bottom. It “sandwiched” a cast aluminum spacer in between the block and the stock pan. It also used a spacer to lower the pick up. The bolts that hold it on can come loose and fall into the pan. It was supposed to have a sheet metal retainer that could be folded up against the bolts to keep them in place. It required two gaskets on the pan and two gaskets on the oil pick up. This one held more oil, but didn’t increase the cooling significantly. Since it didn’t come with a longer dip stick, one just kept the same level.
At least one more pan had a few air tubes running lengthwise through it for air to flow through. It held more oil and cooled it a bit better.
One pan is reported to have the oil drain in the front. One seems to not have spring mounts for the stand. Another one is reported to be of very low quality.
The two possible reasons for using a deep sump are both “slightly” valid. On the /2 they were to help cool a “perceived” hot engine. In a very few cases it may have been necessary, some of which it was the wrong way to cool, another story. While the /2 suffered some piston over heating, the oil was never an issue. I have ridden the R60/2, certainly the worst /2 for heat across Death Valley in the middle of August in the afternoon. The only thermometer I saw said it was 125 F. and I believe it. Yes, I was stupid. Neither the bike or I had trouble with overheating.
Some add an oil temperature gauge to the motorcycle. More than one accessory pan had a provision for a temperature sensor. That is fine if you are the type of person that simply “needs” instrumentation. It is for looks, but it isn’t for any need. You only add another place for oil to leak and cause trouble for normal maintenance. These bikes just don’t get the oil hot under normal conditions. Conclusion, Don’t waste your money
Stripped 2 pan bolts
The pan bolts can easily strip the threads out of the crankcase. It is easy to think that they must be tight so that they don’t fall out. I am sure that it is possible for one to fall out. That would be really bad, depending on the model, as all of the oil would run out very quickly. I have never seen this happen. What does happen is that owners over tighten the bolts and strip out the threads and don’t know it. Then it leaks. The bolts only need to be tightened up a very small amount. There is a variety of types of gasket material available. The /2 used a cork gasket. That one was a bit difficult because the gasket would shrink and leak. It needed to be tightened up soon after use. That pan is made of sheet metal and would easily warp. Over tightening easily warps it and then it leaks. Use your favorite sealer on the gasket and bolts. Oil can run down the threads of the bolts. Then gently tighten up the bolts. Check them often at you install them.
I understand that silicone gaskets are now available and they seal well.
One choice of pan for the /2. Photo from Jim, thanks
One email I received. this is very old and may not be relevant in 2017
Hi Duane, I got the new pan from S. Meyer in Germany and cost $78 Euro plus $29 Euro Postage to Australia. It has the pick-up extension and the lug for the side stand spring( although it is not drilled). It has a row of small cooling fins along the bottom , has the drain hole at the rear and comes with stainless cap screws to mount it. I am not sure of the volume…I THINK it is 2.5 Liters. With the pick-up extension installed, the screen is only a couple of ‘mm’ above the bottom of the pan. It is very nicely made and almost matches the crankcase in color and texture.