I have a 2006 Volkswagen Jetta TDI 1.9L, 5 Speed manual with 196,000 miles roughly, that has a decent puff of blue smoke when it first cold starts. It does start abit harder at cold start, the smoke clears up within 10 seconds. Ive looked online and people say this is fairly normal. Thou i still feel abit nervous, because, this always happens. I can leave the vehicle for 30 minutes and hot start it and does the puff again. NO CEL CODES.

Are my Injector seals leaking? Could it be the valve seals? Any suggestions?