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Old 06-01-2020, 05:45 AM   #81
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Reading a number of books , my guess is many trannys will be happy with non detergent engine oil of the correct weight..

The TD in our Navy Launch used 5 quarts of 50wt Non detergent.

Its hard to find so the simple method is to have your NAPA guy order a full case for you . so nothing will be left over that is hard to sell.

Most can do this easily , tho you may have to wait a week or more for delivery as his distributor will have to special order the case.
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Old 06-01-2020, 10:49 AM   #82
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Old 06-01-2020, 11:43 AM   #83
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I’m amazed! Five pages of comments about oil. My Twin Disc says change oil at 1000 hours running time. There is no combustion so no worries about that type of contamination. With the average of 200 hours a year, many on here may not even own their boats for 1000 hours. Which is a digression I admit. ZF? Borg Warner? Really?

Manual or manufacturer, the rest is just opinion, rumour and guessing.
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Old 06-01-2020, 12:12 PM   #84
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Quote:
Originally Posted by Alaskan Sea-Duction View Post
Ok folks there may be some bad info here.

In my Cat Marine Engine (3208) and Twin Disc (MG-507) manuals it calls for certified TO-2 or C-3 test specification. TO-2 is the old spec. The replacement spec is TO-4. Again this is GEAR oil, not motor oil.

For Delco it is Delco Torqforce 30wt

For Cat it is TDTO 30wt.

Check your manuals. I can't stress that enough. Most of the spec may have been updated. Pretty simple.
Many if not most good single weight CD motor oils meet the TO-2 specification, for example Shell Rotella T1 30W or Delo 400 30W. These are marketed as a motor oil, not a gear oil. There are tractor hydraulic oils that meet TO-2/4, but are harder to find on the dock. Many oils marketed as gear oils have hypoid gear EP compounds in them, and these are specifically prohibited by TD. It is all in the manual, but proprietary oil specs can be a quagmire. There is really not a heck of a lot of difference between gear and motor oils in a 30W.

Also, true synthetic multi-vis oil may not shear easily, but what is allowed to be marketed today as "synthetic" is quite loose. Most of them are dyno oils that have been "converted" to synthetic, and the additive packages that achieve the multi-vis rating are similar.
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