Oil Cooler Line Leak
 

Recently I noticed that my Z was leaking oil. After getting it up on the jack stands I discovered it was leaking from one of the oil cooler lines. Unfortunately I don't think it can be repaired, but before I take the line out and replace it, I figured I would post it here and ask just to be sure. In the attached pic I've circled where it's leaking from.

For reference, it's a Mishimoto Oil cooler that I installed about 7 years ago. I know they don't have a great reputation, so I may replace the entire thing, but I really wasn't planning to spend $450 right now.

Thanks for the help in advance. https://uploads.tapatalk-cdn.com/202...d627eec6bc.jpg

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Oil Cooler Line Leak
 

Are you sure it’s the hose end that’s leaking and not that the banjo fitting to the thermostatic plate is loose? I’d check that first. If it is indeed the fitting….

No need to replace the whole oil cooler kit. It’s just the hose end that is leaking. You can replace the hose itself. Call mishimoto and they’ll probably sell you just that hose, or u can make a new hose yourself if you know what length and what size fittings it has.

OR, depending on if there is enough extra length built in to the hose, you could take the leaking hose off, remove the fitting, cut an inch of hose to have a newly cut section, and then stick a new fitting on it. problem fixed for $10 (cost of a new fitting).


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..........and if you can't do the work yourself bring it to a hydraulic shop and they'll take care of it.

Unfortunately its definitely from the area circled and not from the banjo bolt. I do plan to call Mishimoto tomorrow to see if I can just buy the hose from them. They don't have them listed separately on their website. Hopefully their price will be reasonable.

I can definitely do the work myself. I installed this one just about 7 years ago, so not a problem there. Just a major inconvenience.

Thanks for the responses.

Stupid question: Did you try tightening it?

I did, with no luck.

I am having a similar issue. The oil cooler lines to the sandwich plate leak somewhere in the same area. My setup is Mishimoto as well and about 8 years old. The leak is a slow one. I am planning to replace the lines and banjo bolts.

I have been very happy with the whole setup since New. Just maintenance in my opinion. Nothing lasts forever.

I called Mishimoto and they said I could file a warranty claim. So you may want to do the same. If not, you can order the lines directly from them.

https://www.mishimoto.com/5ft-stainl...-fittings.html

https://www.mishimoto.com/4ft-stainl...-fittings.html

.....hmm more Mishi product problems.

I will say this about my 34 Row Mishimoto Oil Cooler Installation. It cools like a champ. The Banjo Bolts do need to be tightened correctly to get the washers to seal right. Given this, in the 100-107 degree Texas heat, I get 194 degree oil temps in the heat of the day commuting home. A worthy testament to the Mishimoto Product ability to cool your oil. No Regrets here, Thank you Mishimoto.

Those of you having issues with your mishimoto oil coolers, you really need to check and maintain them. They need to be looked after, it is not a set and forget install.