Some smoke on start-up there is from longer term seepage through the valve guides. If it's not fouling the plugs, let it go. You should see my truck smoke after it's run idle a half hour in the emissions station waiting in line. It passes by a hair and it's much worse that that from goosing the throttle for the test after waiting in their line. They wanted to clear the emissions hut because of the smoke, but they are paid by the hour, so they stay. I get to talk with the Englishman at the testing station about "dumping raw petrol" on the ground every two years. Most of the emissions from this truck are emitted there waiting in their line with this old garbage scow.