I know nothing of your particular car, but on my 560 SEL the oil pan replacement was very easy and a new pan from Pelican Parts was not much. Just make sure to get a new gasket. I am not sure if it is the "reusable" type, but I never reuse them. Also I dont think my pan came with a new plug bolt incase you decide to DIY this project. If your car is like mine, it was as easy to change as a wheel.

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1991 560 SEL / 185k miles
1992 750il / 17k miles - project car