Hello,
Newbie here, hoping for some help. I have a much loved 1998 Transit based 'Duetto' Smiley (not banana engine). Last year I noticed a problem climbing hills worse than the normal leisurely ascent caused by camper weight. I had a service including having all the filters changed. That temporarily solved the problem. When it mysteriously re-appeared I had the turbo replaced. The first long journey with the new turbo the same problem happened again but then mysteriously disappeared. Last week it happened then improved after an oil top up. On a long journey this week It was fine one day and bad the next. Any ideas gratefully received and happy to answer further questions.