My 1989 740 Turbo has 160,000 km(+/-96,000 miles) on it and runs very well at all speads in city and under boost. While there are no apparent oil leaks at this time(except for some minor seepage from the oil cap), the oil use on the highway is very high. Any ideas of what could cause this. Given that the car runs so well, could it be a serious problem?
Any insight that you could provide would be appreciated. I do plan to take it into the shop to check it out (brakes, mechanical etc.). Is there anything that I should have checked?
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