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Hello DaWhole9,
Its good that you being careful for your other 2 cars and saving mileage and your money ofc,but maybe 540i is not you best bet in my opinion because these cars are getting older and they become problematic.
With full engine rebuild you have to consider other weak points on these old cars like rear subframe,front+rear suspension,transmission service and bunch of other things.Keep in mind that if you do engine rebuild you need to do it properly if you want to drive that many miles,and if you do it properly we are speaking minimum 5.000$ with head gaskets,crankshaft bearings,valve seals,piston rings,oil pan gasket,bunch of other seals(valve seal,front and rear crankshaft seal etc.)plus water pump,thermostat,spark plugs,coils,injectors recommend cleaning and many other things.
After all is done,that car is going to consume fuel like crazy because it is in their nature.Been there and done that that’s why I say.
Alternative is 530i or 528i in my opinion easier maintenance
Cheers
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