If you choose the E32 or E34 engine, then nothing needs to be done with the oil pan except changing the pan gasket while the engine is out. Other than that, it will be a tight clearance to the steering rack/subframe, but should fit nonetheless. This section will cover all that you need to know regarding the oil pan & cooler.
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Estimating that you are obtaining an oil filter housing from an E32 or E34 engine, there is nothing that needs to be done. If you wish to replace the gasket, do this while the engine is out of the car. See Figure 25 & Figure 26.
The M30 that I purchased didn’t even have an oil cooler. This simplifies the swap a lot too. Now you don’t have to deal with oil cooler line routing and mounting the oil cooler. I have not had a problem on my turbo application at all without the oil cooler. I wouldn’t doubt that it would be a good idea, maybe in the future. This is the way that BMW designed the engine, so I decided not to modify it to any great extent.
Estimating that you are using an E32 or E34 engine, there is nothing that needs to be done for the oil pan. If you wish to replace the gasket, do this while the engine is out of the car.