Oil cooling system design

[johnnybeetle]

Thanks for the input.
The oil I am using atm is 15w 40. As for the oil cooler layout check out my pic.
I know its a bit sad.

I can only assume there is a problem with the oil flow. The front cooler gets warm on one side. Does it return??? The adapter plate has a standard vw golf filter could this be an issue. This has done my head in for a long time and is the main reason I dont drive it.
Cheers again