• 605 660-3339

  • 605 261-8499




Our Mission

We are Schaeffer Oil located in Yankton, South Dakota.

To Increase

To Increase

the Schaeffer brand to be a recognized and respected company worthy of our customers’ trust.

To Provide

To Provide

an educated and specialized approach to all lubrication needs.

To Create

To Create

a trusting, long-lasting business partnership with everyone we do business with.



by the grace of God, serve our customers with honesty, dignity, integrity and fairness.

To Sell

To Sell

a premium product line that creates a joy and satisfaction to the customer when they save money.

Who are we anyway?

Meet the team who built the dream

Mark & Cheryl Wenzlaff

Sales Reps

View Profile

Mark & Cheryl Wenzlaff

How about Some Fun Facts about our company?

Oil and Specialized Lubricants ordered
Clients Worked With
Years of Experience with Schaeffer's Products
Dissatisfied Customers

What our Clients say

  • The thermostat on a machine that is used to clean engine parts malfunctioned during the night and caused severe humidity in the machine shop. As a result, several engine blocks rusted, almost beyond being able to use them. Lorin and Travis decided the Schaeffer Rustender would be a quick fix for the damage and they were right! The blocks soaked one hour. They were taken out and everyone was amazed at the results. The engine blocks showed no signs of rust. The value of the rusted parts was over $8,000!

    — Yankton Automotive Machine, Yankton, SD —
  • It was very common for the Bobcats used at the city garbage facility to have one–two flat tires a week due to nails driven over in pushing the garbage. Chris Haffner stated it took an average of 15 minutes to transport the Bobcat to the city garage, 20 minutes to change the tire, and approximately 30 minutes to fix it, for a total of 1 hr. in labor per tire. All the tires now have Schaeffer’s Tire Sealant and several nails pushed into the tires. The #743 Tire Sealant has been in the tires for 4 ½ months and the have not changed ONE tire! Chris noted he hasn’t even had to add air to the tires! HUGE labor savings and tires, too!!

    — City of Yankton, South Dakota, garbage facility, Yankton SD —
  • We have peace of mind knowing that we’re using the best lubricants possible, Only the rich
    can afford a cheap oil.

    — ARC Farms, Avon, SD, Avon, SD —


We'd really love to hear from you so why not drop us an email and we'll get back to you as soon as we can. You may also call us at 605-660-3339


Yankton, SD 57078

Business Hours

Mon-Fri 9:00 am – 5:30 pm
Saturday 9:00 am – 12:00 pm
Sunday  *Closed*

Call us at :

Mark   = 605.660.3339
Cheryl = 605.261.8499

Our Products

Our services are delivered by our team with years of experience

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