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Message: [QUOTE="Powerstroke Man 6.4, post: 1098517, member: 4573"] I would like to know this also (I found this all this info in the manual) Wondering what you guys think. For the Dana 80 (F-350 DRW) (My Truck) Ford says to change the rear and front diff fluid every (50K Severe duty) (100K standard duty) and use limited slip additive if your rear end is equipped with LS SRW's (10.50) Ford says the axles is lubricated for life unless the axles are submerged in water then it immediately needs changing and add LS additive if your rear end is equipped with LS. Should it be the same as the Dana 80's and replaced every (50K Severe Duty) or (100K standard duty)? Front Front axle 5.8 pints (2.8L) Motorcraft SAE 80W-90 Premium Rear Axle Lubricant XY-80W-90–QL / WSP-M2C197–A Rear Rear axle - F-250/350 (10.50 inch axle)1 6.9 pints (3.3L) Motorcraft SAE 75W-140 Synthetic Rear Axle Lubricant XY-75W140–QL / WSL-M2C192-A 4 oz of Ford's XL-3 Friction Modifier if LS Dana M80 Rear axle - F-350 (DANA M80) 8.5 pints (4.0L) Motorcraft SAE 75W-90 Synthetic Rear Axle Lubricant XY-75W90–QLS / WS Rear axle - F-450/550 (Dana S110/S130) 14.0 pints (6.6L) Motorcraft SAE 75W-140 Synthetic Rear Axle Lubricant XY-75W140–QL / WSL-M2C192-A 4 oz of Ford's XL-3 Friction Modifier if LS Brakes Ford says brakes last 100K but I got 89K on my DRW and I changed them at 80K (Motorcraft) Power Steering Power steering fluid Keep fluid level between MIN and MAX on reservoir MERCON V Automatic Transmission Fluid XT-5-QMC / MERCON 3-4 quarts Dealer changed mine at 71K [/QUOTE]

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