Dear members, I don't have much knowledge of cars but like to do whatever I can as DIY if given help and guidance.

Car details

Ford Focus 1.8 TDDi

Mileage – 160,000 miles

Problem

1. Delayed / sluggish when cold-starting after few hours / overnight. Takes around 4-6 seconds of cranking. Been happening for a week.

2. Mild smell of diesel inside

Observation

1. Opened the hood and noticed dried off oil leak around second injector from left.Rest of the injector areas are dry. The leak had kind of dried off probably because vehicle was parked overnight. No oil drips on drive way when its usually parked.

2. Decided to take for a drive for few miles, opened the hood again and saw fresh leak around same area, which confirms it leaks when the engine is running.

Background

I had experienced smell of diesel inside the car last year around same time, no sluggish start though if I can remember. Took the car for service and mentioned about the problem. Mechanic said there was a leaky pipe which has been replaced and charged £25 for that bit. I didn’t ask for details. I remember vaguely the leak was around same area back then.

Question

What are the chances this leak and sluggish start to be related?

What sort of DIY checked and fix can I try please?

Any help would be well appreciated.

Thanks.