Oil cooling lines leaking

The shop just told me the oil cooling lines are leaking in my '95 suburban. This sounds like a fairly simple part to replace but all the searches I did pulled up coolant leaks, not oil cooling line leaks. Any DIY for this?

Also, the shop said the oil filter assembly was leaking - some part that is between the filter and the block. He said it was orings that need replaced between this assembly and the block. This also sounds like simple DIY work. Any advice?

Thanks in advance.

I've done both items and you bet, both are DIY items.

One of my oil cooling lines leaked on my 1994 Ext Cab. GM sent me the wrong hoses and in fact, later told me my truck doesn't have an oil cooler. I had the build sheet to prove it. GM has tons of part numbers for the replacement hoses.. SO, I took them to a local Hydraulic Hose place and had them rebuilt. Cost $15 total! At the same time you have them off, replace that O-ring on the oil cooler mount. There is a Felpro set for that at your local auto parts store.

Tips I found: When removing the oil cooler lines, don't worry about trying to squeeze the quick-disconnect clips. They won't budge, just go ahead and unscrew the fitting from the oil cooler. (The radiator side is simple). BUT FIRST, mark on each cooler line a reference point so you know how to get them back on. If they are put on a little "turned" on the cooler end, they will leak. Hope this doesn't sound confusing, just mark.

Good luck! Pat

I highly recommend that you also replace the O-ring and gasket at the mounting point for the oil cooler lines (where the oil filter attaches).

Felpro has a gasket set ES72671 that includes all of the gaskets, O-rings, and seals for the oil cooler lines. Or at least make sure the new lines come with all the gaskets, O-rings and seals.

I had an oil leak that I thought was the rear main but actually was the O-ring for the oil filter adapter.

//2000CAYukon

Ooops! Sorry Pat. I now see that you already said what I said. Sorry about that. At least I have the part number.

//2000CAYukon

As a two-year old follow up to this post. I got a quote to have the oil coolant lines changed for around $650. I bought the parts for around $40. I changed them all out, which took about two hours and included the o-ring and gasket. Not a drop of oil for about a year. Then the oil started leaking again. I took it to the dealer for some other problems and had them changed while the thing was in the shop. Leaks were fixed again. It has been about another year and I have oil dripping again. Shouldn't these things last longer than a year?

As a two-year old follow up to this post. I got a quote to have the oil coolant lines changed for around $650. I bought the parts for around $40. I changed them all out, which took about two hours and included the o-ring and gasket. Not a drop of oil for about a year. Then the oil started leaking again. I took it to the dealer for some other problems and had them changed while the thing was in the shop. Leaks were fixed again. It has been about another year and I have oil dripping again. Shouldn't these things last longer than a year?

I had my mechanic replace the oil cooler adapter seals a few years ago. But it started leaking again, apparently. I bought the Felpro kit as well (at Checker Auto) but haven't installed it yet. Yes, I wish the orignal fix had lasted longer; guess it's like my leaky rubber seals on my "lifetime warranty" master cylinder (between the reservoir and the MC), which looks like it's being R&R'd in January, as separate seals are not available, even at the dealer. I've already swapped it out once for same reason.

As a two-year old follow up to this post. I got a quote to have the oil coolant lines changed for around $650. I bought the parts for around $40. I changed them all out, which took about two hours and included the o-ring and gasket. Not a drop of oil for about a year. Then the oil started leaking again. I took it to the dealer for some other problems and had them changed while the thing was in the shop. Leaks were fixed again. It has been about another year and I have oil dripping again. Shouldn't these things last longer than a year?

I've read where the aftermarket cooler lines were better than the GM lines. I think I would try out NAPA to see what they have for this issue.

I've read where the aftermarket cooler lines were better than the GM lines. I think I would try out NAPA to see what they have for this issue.


On my 96 impala the oil cooler lines leaked at the hose crimp next to the radiator...because this was not to bad of a leak I got two s/steel hose clamps of the proper size about 5/8in dia and with a 1/4 in ratchet tightened securely...that was in 1999...2008 this has still held..the metal is soft aluminum and does not maintain a good tight fit.

I have read where this crimp metal was removed and hose clamps also worked...but in my case just the added clamp support was all that was needed....