Most 103 engines that use oil suck it in through the valve guides past the valve stem seals. My 103 has been using a lot of oil (1 qt for 800 miles) for years. I eventually will replace the seals or have it done when it needs a valve job.
You can have the seals replaced and it will help for a while.
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1990 190E 2.6
1996 Grand Voyager 3.3
1985 Mustang GT 5.0 5 SPD
1982 Suzuki GS 750T
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