Elite Contributing Member
Car: 2006 Chrysler 300C CRD Touring in Mineral Grey
Join Date: Aug 2006
Location: Surrey, England
Thanked 265 Times in 250 Posts
If you had leaking diesel below the fuel filter, that might explain why your oil cooler seals have perished.
Do you have an alternator shroud fitted? If not, then fuel leaking on the alternator will result in its early demise, as will any oil spilt from the filler tube.
There are many posts from the past relating to replacement fuel hose replacements, so a search could provide the info you are seeking - as yet I haven't needed to touch mine, but I keep an ever watchful eye. It might be worth trying the custom300cshop.co.uk for replacements and/or advice. Don't be tempted to buy silcone hoses as these are not suitable for diesel.