Oil cooler o rings.

[Black dawg]

Have been doing many oil coolers on the idi pickups as well as 7.3 powertroke trucks lately. The last several I used permatex tune up dielectric grease on the o rings for lube. I have used many different things over the years, but for what ever reason this stuff is by far the best I have used.

They just go together much easier, even with some slight misalignment.

 

[ttman4]

I don't know bout permatex tune up dielectric grease but I've used regular Dielectric Grease rebuilding oil coolers as well as lots things.

 

[Black dawg]

I have used other brands of dielectric grease, but this stuff is just a little different. Seems thicker, stickier...

 

[Old Goat]

Thanks for posting your good results. Always great to have another product that works good.
Those Coolers are choir to get together even when things are going right.

When I did the Cooler on the 86 a few years, I used Syl-Glide.
Maybe you tried that one also?

Sil-Glyde Silicone Brake Lubricant

Sil-Glyde Silicone Brake Lubricant Description Sil-Glyde Brake Lubricant is a silicone-based brake lubricant recommended for the entire brake assembly, is compatible with plastic and rubber (EPDM & Nitrile), and dampens vibrations between contact points. It is moisture-proof and heat resistant...

www.agscompany.com

I see this one listed also, says for weather strip etc... maybe this is the one I have. Maybe the same stuff?

Ags Sil-Glyde Silicone Lubricant, Tube, 4 oz SG-4 | Zoro

Order Ags Sil-Glyde Silicone Lubricant, Tube, 4 oz, SG-4 at Zoro.com. Great prices & free shipping on orders over $50 when you sign in or sign up for an account.

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Goat