@OrganicFoxes @foama Thanks both. Definitely I have to secure the air box and see if the noise goes away. It's a bit loosely.
When I do that I will check the spark plugs. I have checked a couple of website for the "correct" spark plugs, but I'm finding different part numbers:
1822A071
https://www.ebay.co.uk/itm/305118381...EaAu5YEALw_wcB
1822A086
https://www.mitsubishipartsnow.com/o...bC1sMy1nYXM%3D
Maybe do you know which is the right one or if both of these are ok please? I may ask the dealer too.
I have checked the "thimble" and it looks fine, completely dry and perfectly going up when I push it.
Regarding the oil leak I'm a bit confused as I have spoken with a 3 different mechanics already and they told me that it is the driveshaft seal that is leaking when the car is running as there is no drops on my driveway at all but only around the seal/shaft area. One of them even recommended replace the driveshaft and the seal. I have checked around and I can't see oil at any point above that point. As soon as I can I will do the full clean up and dry of the area and see if it still leaking from there. Here there is a video of that area:
https://youtu.be/VvnmRE1FVPQ?si=7qj1zdUiU6Wj2KYe
Also I have contacted mitsubishi dealer as I couldn't find almost any parts for this car around and I got the prices for the possible parts I may be looking for:
Front Right Driveshaft 3815A428 £427.13 special order (I also have knocking driveshaft when turning)
Front Left Driveshaft 3815A427 £518.00 special order
Front Left Shaft Seal 2502A050 £11.30 in stock
Front Right Shaft Seal 2522A278 £12.80 in stock
Front Right Outer Boot Kit 3817A210 £69.65 special order (Considering this or aftermarket if right inner joint is ok)
Gear oil Fill/Drain Plug 3713A012 £3.03 special order
Fill/Drain Plug seals 1200A277 £2.14 in stock
Gear oil £5.45per litre.
Special order can take up to 14 weeks... so hoping to not to replace the shafts.