peterpointer12

I'm hoping that someone out there can give me some feedback on an intermittent problem I'm having with my Zafira 1.6 Petrol 2010 plate. The car apart from this annoying current issue is in excellent condition for it's year. It starts on the button every-time, the engine is as sweet as a nut ..... no issues with either. The problem I'm having is this : Every now and then there is a large plume of grey/blue smoke coming from the exhaust lasting approx 4/5 secs. This can happen 1/2 times per day every 2/3 weeks. Oil and water have been checked for cross contamination..... none found , also no sign of any oil leaks. Oil light has come on just once and went off again on restarting engine. Hasn't come back on since. It has been put to me by a mechanic that the oil cooler seals are the issue. I'm struggling to work it out how this could be the problem. I would really appreciate any thoughts or feedback . Have you heard of this happening before. Many Thanks for reading .