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| Joined: | 12-28-2015 |
| Location: | Manchester, New Hampshire USA |
| Posts: | 53 |
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Ditto what Brett said. The 20W 50 engine oil is fine for the thrasher 4 speed (it's recommended for that), but I would never use that in the Getrag. Parts for those are unobtainium now and you will benefit from a high quality, synthetic GEAR oil of the recommend weight.