1994 F350 5.8 Oil cooler insert options

Reply Subscribe

Thread Tools

Search this Thread

Apr 27, 2026 | 05:52 PM

ronhammond

Thread Starter

6th Gear

Joined: Feb 2007

Posts: 6

Likes: 0

1994 F350 5.8 Oil cooler insert options

Hello- 1994 F350 with 5.8 gas. All at once oil started leaking where the oil cooler insert connects to the block. Went to NAPA and the part F4TZ-6L626–A is no longer available from Ford. Didn’t see it on other aftermarket sites either.

I read that some people have removed the cooler, installed a new filter nipple, replaced the bottom radiator hose with one without the connections to the cooler, and installed a different filter. So the question is:

Anybody know exactly what parts are required for this option, or does anybody know of a replacement for the factory cooler. I’m good with either, as I don’t tow or haul much these days. Thanks for your wisdom.

Last edited by ronhammond; Apr 27, 2026 at 05:54 PM.

Apr 27, 2026 | 08:36 PM

R&RFord

Fleet Mechanic

Joined: Aug 2015

Posts: 1,829

Likes: 360

From: Candy Mountain

You need this?

Apr 27, 2026 | 09:42 PM

Wheezingthunder

5th Wheeling

Joined: Apr 2026

Posts: 46

Likes: 9

Maybe swap the o ring from the old filter onto the cooler sounds like the cooler is fine but the o ring is leaking

Apr 28, 2026 | 10:32 AM

1Butcher

Cargo Master

Joined: Mar 2007

Posts: 2,791

Likes: 1,009

I am a fan of oil coolers and liquid coolers are on the top of my list. I would not remove the cooler unless it was to get me home. I agree with @Wheezingthunder . Take off the cooler and replace the rubber seal. Maybe the fitting is loose causing the seal to leak. It would replace the seal no matter what happened.

While you are there, how is the rubber coolant hose?

Apr 28, 2026 | 11:24 AM

ronhammond

Thread Starter

6th Gear

Joined: Feb 2007

Posts: 6

Likes: 0

Thanks for the info folks. I’ll remove the cooler and check it out and replace the two hoses and o ring if it’s not the cooler itself. Will let you know if I need to find a replacement.

Thanks again
Ron

Apr 28, 2026 | 12:23 PM

ronhammond

Thread Starter

6th Gear

Joined: Feb 2007

Posts: 6

Likes: 0

Today | 04:53 AM

ronhammond

Thread Starter

6th Gear

Joined: Feb 2007

Posts: 6

Likes: 0

Update- took out the leaky oil cooler, replaced the lower radiator hose with one for a 5.0 without oil cooler routing. Turns out when you remove the piece holding the cooler to the frame the threaded piece still attached to the block will accommodate a Napa 1515 oil filter perfectly. Put everything back together, put in new antifreeze, added oil, and no leaks and good oil pressure.