# Main Bearing Oil Seal Additives

**URL:** <https://59plymouth.net/t/main-bearing-oil-seal-additives/2734>\
**Category:** Tech Support\
**Created:** [February 11, 2016, 6:32pm UTC](https://59plymouth.net/t/main-bearing-oil-seal-additives/2734 "2016-02-11T18:32:05Z")\
**Posts on this page:** 3\
**Page:** 1

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**Author:** ![Donny](https://59plymouth.net/letter_avatar_proxy/v4/letter/d/f04885/32.png) [@Donny](https://59plymouth.net/u/Donny)\
**Post date:** [February 11, 2016, 6:32pm UTC](https://59plymouth.net/t/main-bearing-oil-seal-additives/2734/1 "2016-02-11T18:32:05Z")

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I have heard so many excellent reports on the additive AT-205 Re Seal product for stopping oil leaks on oil seals(rubber). However I am wondering if they work on the old style rope seal in the 318 Poly engines in our 59s etc. Don.

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**Author:** ![Dick\_Koch](https://59plymouth.net/user_avatar/59plymouth.net/dick_koch/32/19_2.png) [@Dick\_Koch](https://59plymouth.net/u/Dick_Koch)\
**Post date:** [February 11, 2016, 11:06pm UTC](https://59plymouth.net/t/main-bearing-oil-seal-additives/2734/2 "2016-02-11T23:06:20Z")

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Don - Most oil additives are formulated to swell rubber seals. Assuming rope seals are organic i.e. sisal or hemp I doubt an additive would have any effect. Try asking GOOGLE the guestion.  
Dick

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**Author:** ![RICKYMOPAR](https://59plymouth.net/user_avatar/59plymouth.net/rickymopar/32/35_2.png) [@RICKYMOPAR](https://59plymouth.net/u/RICKYMOPAR)\
**Post date:** [February 13, 2016, 1:53pm UTC](https://59plymouth.net/t/main-bearing-oil-seal-additives/2734/3 "2016-02-13T13:53:04Z")

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Replacing rear main seals on our favorite choice of vehicles is an easy endeavor. Changing from **rope seal to two piece neoprene** is okay also. KD Tools make a handy to use seal replacement set, well worth the money. I have no preference of type of seal and use both.