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Q: dirty oil cap on 1997 Lexus ES300

I removed my oil cap and it is dirty inside valve cover and cap. What is the cause of this is it going to cause damage?
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Lexus changed/shortened the recommended oil change intervals due to a build up of sludge in these engines. Initially the oil change intervals were too long, great engine, change the oil every 3000 miles and should be all right.
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