Quote Originally Posted by nb99 View Post
Quick Update - In case anyone else finds this thread with the same problem, after doing more research online I found that too much engine oil could give the same symptoms. I tested the dipstick and indeed there is way too much oil in there. Have booked in for a service next week so hopefully this could solve the problem. Fingers crossed!
Ask yourself "where did the additional oil come from", leaking injectors raise the level and dilute the oil.

Quote Originally Posted by dan2485 View Post
That could be leaky injector related as fuel could be getting into the oil hence why the level is high.
You beat me to it, a raised (thinned) oil level is the confirmation symptom of injector wear diagnosis in addition to white smoke