1981 240d burning oil

Changed my valve guide seals using your kit about a week ago. Very good information provided in the book. Thanks.
I have not seen a reduction in oil consumption and still have a good bit of smoke at start up. My car is burning approx. 2 quarts per 300 miles. 211,000 on the clock. Runs great, seems to have full power and starts up every morning. What should be my next step in reducing the amount of oil being burned? (I have no leaks) I am using delo 400 15/40 or rotella 15/40.
Any advice would be appreciated... thank you.

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