I think the oil cooler is one of the most important things on these engines that improves their life. On hot summer days I cannot put my hand on the out going line but I can on the incomeing. I would fix it asap, either by finding a VW cooler and having a shop crimp on new lines. Or try the junkyards.

I would not run this engine in the summer without one.

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2006 CL500
2009 C300 4matic
1969 280SE
2023 Ram 1500
2007 Tiara 3200