I am completely at a loss as to where the oil is going. I had the valve seals reaplaced last year, there are no obvious oil leaks and it does not appear that I am burning oil yet for the second time in 3 months I had to put 3 quarts of oil in my car yesterday and am clueless as to what else it might be. Any thoughts.

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89 190E
2.6L
Arctic white
Grey leather
Sunroof
Pirelli P400 rubber
Smoked corners