Question about KitchenAid K5SS Heavy Duty Commercial Stand Mixer

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Kitchenaid mixer leaking oil

I recently found our Kitchenaid K5SS Mixer laying on its side with over a tablespoon of lubricating oil polled beside it. Is there a way of replacing this oil without total dismantle? Will the loss of this oil be harmful to the motor if not replaced? Thanks for any help!

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  • tntcrone May 11, 2010

    Do not dismantle until you are sure about what you are doing. It is possible that the oil encased a coil and opening the coil and releasing the remaining oil spells major repair.



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Some of the oil has separated from the grease inside the transmission, the grease should be replaced. You don't need a total dismantle,. simply remove the top cover and the transmission housing. Remove as much old grease as you can, then replace it with grease from Kitchenaid Parts, or locate a Shell Oil distributor in your area, you want Shell Darina XL EP-2. The oil that came out of your unit probably won't be enough to do immediate damage, but because it's separating, it's becoming less effective. It'a messy job to remove it but will add years of life to your mixer. If you find this solution helpful, please rate it. Good luck. ricardok45

Posted on Jan 05, 2009


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How do I replace the oil that came out when the mixer was stored on its side?

Mary Ann,
There actually is not actual oil inside the mixer. There is however GREASE. When the grease gets old it can begin to separate and then leak out like oil. The grease needs to be replaced in the mixer. You can find online video's on how to that and where to get replacement grease.

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Trying to determine how to lubricate the gears?

Hi CONTACT_TOS. I’m not sure what removable cap you are referring to, unless you are referring to the two plastic caps with screwdriver indents on opposites sides of the head? Do not remove them. Those are Brush Holder Caps for access to the electric motor brushes. You do not want to remove them unless you are replacing the brushes.
Why do you want to add lubrication to your mixer? The internal gears of your mixer are factory packed with enough grease to last a 'lifetime'. Unless your mixer is quite old; greater than 10 years, you shouldn’t have to replace any transmission lubricant. Your mixer’s transmission lubricant (grease) does break down over time and usage into its components; basically oil and suspension additives, and sometimes your mixer might leak a little oil that has seeped beyond the transmission gasket and found its way out of the mixer. Gravity can be very insidious. But even then, if the amount of oil you find leaking is small and your mixer seems to be operating normally, you needn’t worry about the replacing the lost lubricant.
If you still wish to check or replace the lubricant, that’s OK, too. It never hurts to get under the ‘hood’ of your mixer and see how it all works. Before you get started though, it would be helpful to have the Parts List manual on hand. If you're lacking one, you can download a PDF version from the KA website at:
Click on Customer Care>Locate Manuals & Guides> and select “Consumer” for User Type, then enter the 6 character Model Number, in your case use KSM50P (Your K5SS mixer falls within this manual), and select the first file KSM50P.pdf (438.31 KB) listed under Parts List (4). (Check to verify this matches your mixer model.)
Turn to pages 4 & 5 titled: “Case, Gearing & Planetary Unit,” for the disassembly, troubleshooting, and reassembly of your mixer’s transmission gears, along with all the parts. It can get quite messy but be gratifying to diagnose and repair your mixer yourself.
Once apart you can check for any unseemly wear and tear on the gears, etc. You may also want to consider replacing all the grease, particularly if debris is suspended in it.
Besides any replacement grease you might consider replacing the gasket (Illus. No. 26), too. I recommend using a food-grade grease that you can order online (although I’ve seen automotive bearing grease used too – your call).
Here are some links to several excellent websites that detail the disassembling/greasing and reassembly of a KA Mixer. The mixers displayed in the links are different KA models, but the principles are the same.
Between these three websites and their excellent pictures and descriptions and your Parts List manual, you should now be able to completely disassemble and reassemble your mixer along with replacing the lubricant if you wish to.
Good luck and have fun. I hope this helps. Howard, Burke, VA
If this solution has helped you, please rate it. – hslincoln

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My kitchenaid mixer was stored on its side and leaked oil. I don't dare use it now. Can I replace the oil myself? There are no mixer repair centers anywhere near me.

your oil leaking is cause by a bad gasket or the gasket isn't seated properly. you can purchase this gasket but replacing it does require knowledge of the unit. part number for the gasket is 4162324. the grease can be purchased locally at any car parts dealer. generally a thicker paste type grease is used inside these units, but the original part number for the grease is 4160588 and comes in a container with enough grease for 5-8 mixers.hope this helps


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Called the Kitchenaid toll free number and found a local authorized repair center. Not a fixya solution, but at least a solution.

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Hi Tim. Don't try to pour anything into the side openings, these openings are for the electrical brushes. You didn't state what model you have so my help is limited. Goto and click on the customer care tab. Enter your mixer's model# into the search window. Look for a parts catalog for your mixer. If there is one, download it.

Your mixer uses grease to lubricate it. If it's leaking oil, the oil and old grease must be removed and replaced. Chevron FM ALC EP-2 is a "Food Grade" grease, use it to replace the old stuff. The transmission housing and Planetary assembly will have to be removed to accomplish this. It's a messy, but necessary task. Once completed, run the mixer for a few minutes each week to keep the oil suspended in the grease, this will extend the life of the new lube. Good luck!

If this solution has assisted you please rate it. ricardok45.

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