Golfman

I have noticed in the last few weeks, that when I start my Solara in the morning, I get a small puff of blue smoke and then it changes to regular exhaust. I have 160,000 km. on the engine and regular oil changes have been done. My mechanic has suggested an engine flush. I have been reading that something like that may be good or bad for the engine. It's a 2.4L engine. Anyone out there with the same problem? I would appreciate any feedback.