Not sure what happened really, topped up oil and water (had warning oil was low) went off to petrol station fine, filled up with correct petrol and went off, about a mile down the road there was whitish/blue smoke billowing out the back of the exhaust while the car itself seemed to lose power on/off and jump along. Turned off ignition sat for a min, tried again, same thing happed - was on way to pick daughter up from camp so had no choice but to drive it steady and get there (7 mile) further along it started to ease off smoking and ran better. Picked daughter up and did the same 7 mile back home with no problem!! Is there something I need to check or could it just be a big blip of some sort, thanks in advance.