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Crankshaft oil seal leak - BMW 3 series 2007

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I recently noticed a very slow oil leak which a garage tells me is coming from the rear crankshaft oil seal. It had apparently leaked into my starter motor which had started to fail and has now been replaced. To avoid another starter failure I need to correct the leak and would appreciate your views on:

- Use of oil additives to stop leaks. Are they safe to use and do they work

- Possibility of an oil breather problem causing pressure build up (Its the N47 diesel engine)

- Is it highly likey it is the crankshaft seal and I should just shell out and get it replaced

- How much would you think for full job?

Really appreciate your advice


Jeff

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