I have to replace an oil cooler line and was wondering if I could use high temp (gas rated) tephlon tape? I know a lot of people are going to tell me it's not necessary but the hoses I'm putting in are used and I just wanted to be sure. I am more worried that it would degrade.

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1982 300SD
1967 250S
...what was I thinking......

no. Buy new cooler lines online, replace them the hard way. If there is any partr under the hood to not be cheap on, this is it.



Also, no, you dont need teflon tape. It is a compression fitting, it should not leak.

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1981 300SD 512k OM603

yeah, the last thing you need in your oil cooler is pipe dope/tape... those oil lines are hard enough to install when new and flexible... I wouldn't wanna try it with old hardened lines...

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John HAUL AWAY, OR CRUSHED CARS!!! HELP ME keep the cars out of the crusher! A/C Thread
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My drivers:
1987 190D 2.5Turbo
1987 190D 2.5Turbo
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1987 300TD
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1994GMC 2500 6.5Turbo truck... I had to put the ladder somewhere!

maybe the tape would keep the fittings from bonding w/ the threads on the OC?

If you were careful about wrapping, I dont see an issue. but thats just me;P

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1984 123.193 372,xxx miles, room for Seven.

1999 Dodge Durango Cummins 4BTAA 47RE 5k lb 4x4 getting 25+mpgs, room for Seven.

Use anti-sieze on the threads, not teftape.

Use some brand of Never-Seez on the threads. For the tape to effectivly seal anything it would have to cover the sealing lip/end of the hose or cooler. If you must use something I would think that some thick pasty sealent dabbed carefully on the sealing edges would do the trick. The old school brown non-hardening Permatex would work and and would most likely stay put if some oozed into the oil flow. (By the way the oil from the oil cooler is filtered by the bypass part of the oil filter before it goes back into the oil pan.)

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84 300D, 82 Volvo 244Gl Diesel

Ditto.

The oil going through the cooler is not filtered yet so you don't have to worry about anything getting into the oil.

You don't need to put anything on the threads, just make sure they are clean.


Used oil cooler lines? They are a huge PITA job to do on that car why would you want to put a part in their that is shot?

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1999 SL500
1969 280SE
2023 Ram 1500
2007 Tiara 3200

Phorget about using any sort of tape on those threads. Teflon tape is phor plumbing and gas (in your home).

You don't want that anywhere near an oil line, phor phear of small pieces tearing off and entering the oil stream. They could plug a piston oil squirter or something else very bad.

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'98 E300 turbodiesel

I've not had a look at the oc lines, but I'm gonna hazard a guess that they are compression type fittings with a flare on one end that seats in the other. No need for any teflon tape, but "never seize" compound might be a good idea. Don't overdo the neverseize (brand name). They are lithium based greases.

Given the quality of plumbing fittings, apparently all from China, I have quit using teftape and use pipe dope.

The oil returning from the oil cooler goes through the oil filter before it goes anywhere else.

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84 300D, 82 Volvo 244Gl Diesel