I've got a Bentley manual with the factory specifications in it. But if I remember right, the recommendation has always been to set the valve lash at .013 cold instead of the factory .012 setting to help the engine idle better. I also believe the recommended plug gap should be set at .032-.034 instead of the factory .028-.032, again to promote better idle. Am I remembering this all right???

Grace and peace,

Robert K
1991 535i