Dry Sump Drive # 6 question
12-02-2023 | 07:49 PM
#11
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Joined: Jul 2013
Posts: 833
Likes: 639
From: Paducah,Ky
Different drives, imco scx-4s, and different lube but I noticed a change in color around 2021 in the Torco RTF, from a deep blue to a green color. Shortly after I lost both drives. Rebuild and still running Torco RTF because that’s what imco swore by, but then they had started making their own lube… This past season noticed drives weren’t shifting good. Pulled drives and found black tarry substance on every surface! Long story short, no longer using junk Torco! Amsoil severe gear.
12-02-2023 | 08:00 PM
#12
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Joined: Nov 2004
Posts: 14,140
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From: On A Dirt Floor
I don’t have #6 drives, but i googled 
the question and found a a Merc service bulletin on draining/filling VI dry sump drives:
https://holesbaymarine.co.uk/catalog...5DUCNCBFZYGIZQ
the question and found a a Merc service bulletin on draining/filling VI dry sump drives:https://holesbaymarine.co.uk/catalog...5DUCNCBFZYGIZQ
12-03-2023 | 02:25 PM
#13
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Joined: Jun 2001
Posts: 2,303
Likes: 109
From: McHenry, Illinois
I have owned a cat with wet sump sixes and two cats with dry sump sixes. Torco MTF is what is used on dry sump 6's. It is a manual transmission oil and it is what Mother Mercury says to use. Summit Racing sells it. Buy a 5 gal pail for $220.
12-03-2023 | 03:11 PM
#14
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Joined: Sep 2007
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Mercury issued a service bulletin in 2013 stating their new racing gear oil replaces the Torco MTF. It's used in all their racing gearcases/outdrives including dry sumps. The Torco is still a great oil and can still be used.
Last edited by oceanoutlaw; 12-03-2023 at 03:25 PM.
12-04-2023 | 03:47 PM
#17
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Joined: Apr 2007
Posts: 595
Likes: 103
From: Ontario
Mercurys new 85w90, its gold/ brown in color. Mine comes out looking the same as it went in every oil change.. good stuff!
12-04-2023 | 06:01 PM
#18
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Joined: Sep 2014
Posts: 869
Likes: 258
From: Portland, OR
This.
I have not used in my dry sumps yet but I have heard good things about it. That is until they change suppliers in the quest for more profit as always...
I have used the Amsoil 75w-90 marine gear lube in them the last couple of years from my old boat to get rid of it and zero issues looks the same coming out as it did going in. Going forward I will use the Merc racing stuff so the weight matches.
I have not used in my dry sumps yet but I have heard good things about it. That is until they change suppliers in the quest for more profit as always...
I have used the Amsoil 75w-90 marine gear lube in them the last couple of years from my old boat to get rid of it and zero issues looks the same coming out as it did going in. Going forward I will use the Merc racing stuff so the weight matches.
Last edited by Diamond Dave; 12-04-2023 at 06:08 PM.
