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| I have a 10k d6c and run cat tdto 30wt in the trans and the tdto 50wt in the finals. 15w40 in the motor. Was told not to run 80/90 in the finals incase it starts swapping some oil with the trans. The cat oil is around $100 a 5 gal bucket and gets delivered free to the cat parts drop in our small town. If you drain the trans might want to replace the suction hose while its empty and clean the screens, If i remember there's 2. | |
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