As stated in the title, I'm currently looking at a BMW e12 530i for sale. It has been converted from a 4 speed manual to a 5 speed manual. Has brand new spark plugs, brand new cooling system including all tubes and hoses, and brand new belts. Only issue the owner has pointed out is that the diff seal has a small leak. Is that something to be concerned about? The drive back from picking it up would be about 400 miles. I know the seal is a cheap replacement. Overall is there anything else I should be asking the owner about? Should also mention the odometer only reads 107,000 miles. Thanks again.