Grundl Auto & Diesel

Grundl Auto & Diesel Diagnose and repair all makes and models of diesel vehicles. Specializes in Ford Powerstroke Diesels and Volkswagen TDI's.

We apologize for the late post, but we have been discussing all morning if we should be open today or not. We have decid...
03/16/2026

We apologize for the late post, but we have been discussing all morning if we should be open today or not.

We have decided (and I finally have Ryan convinced not to travel anywhere), it is best for us to just stay home. It’s not worth the travel risk.

We will be CLOSED today, Monday, March 16th.

We apologize for any inconvenience. Hope everyone stays safe and warm! ❄️☃️💨

02/04/2026

Ryan’s cell phone may or may not have been ran over with a pickup truck yesterday at the shop 😅

With that being said, we can hear the sound when he gets a notification but the screen doesn’t work so we can’t do anything with it.

We know how important his phone is with the business and we are doing our best to get it fixed as soon as we can

PLEASE do not contact his personal cell phone, you will not get an answer. If you or someone you know is trying to get ahold of us for any reason, please contact the business phone at 920-849-8525. OR you can contact Danielle’s personal cell phone if you have her number.

Thanks!

As the holidays quickly approach us, we just wanted to share our business hours over Christmas and New Year’s. Thank you...
12/19/2025

As the holidays quickly approach us, we just wanted to share our business hours over Christmas and New Year’s.

Thank you all for continuing to support our small business! We greatly appreciate it.

Here’s to another healthy and prosperous year.

Wishing you and your family a very Merry Christmas, and a Happy New Year!
🎅🎄🎉

The Grundl’s,
Ryan, Danielle, and Shadow 🐶

This wonderful weather has brought us no power! ❄️💨Doing the best we can, but it’s quite hard to work in the dark. Hopef...
11/26/2025

This wonderful weather has brought us no power! ❄️💨

Doing the best we can, but it’s quite hard to work in the dark. Hopefully it’s back on soon!

We will be closed for the rest of this week to spend time with our families. Wishing you and your family a very Merry Ch...
12/24/2024

We will be closed for the rest of this week to spend time with our families.

Wishing you and your family a very Merry Christmas! 🎅🎄

2022 Cummins Lifter Failure Truck came in with a tapping noise at only 140,000 miles. Pulled the lifters out and found o...
10/24/2024

2022 Cummins Lifter Failure

Truck came in with a tapping noise at only 140,000 miles.

Pulled the lifters out and found one had a flat spot in it. We are replacing the troublesome lifters with the solid tappet conversion from Hamilton Cams.

We will be closed Monday, September 2nd for Labor Day. The weather forecast looks beautiful! Be sure to check out the Ca...
08/30/2024

We will be closed Monday, September 2nd for Labor Day.

The weather forecast looks beautiful! Be sure to check out the Calumet County Fair. ☀️

Wishing you all a safe and fun holiday weekend! 🇺🇸

On today's episode of "What the ... " Ryan and I heard chirping in the shop this morning, but we could not figure out wh...
05/31/2024

On today's episode of "What the ... "

Ryan and I heard chirping in the shop this morning, but we could not figure out where it was coming from. We thought it was just a bird flying around in the shop since we have the doors open today.

After further investigation, we ended up finding a bird's nest in the rear bumper of a customer's truck!! The truck was dropped off this morning, so the birds must have had one heck of a ride over here!

Ryan pulled the nest out from the bumper, and we went out back to dig for worms. We fed worms to the birds, and shortly after that, they both jumped out of the nest on their own.

The birds are currently running around doing their own thing with full bellies.

There's always something interesting happening around here!

‼️Due to the weather, we have decided to close at 1 today‼️ Roads are VERY slippery, white out conditions, and windy. St...
01/12/2024

‼️Due to the weather, we have decided to close at 1 today‼️

Roads are VERY slippery, white out conditions, and windy. Stay home if you can.

Stay safe and stay warm everyone! ❄️☃️

For those of you who have been asking, we finally got around to having new apparel made with our location updated on the...
10/20/2023

For those of you who have been asking, we finally got around to having new apparel made with our location updated on them! 🤩

We have both t-shirts and sweatshirts available.

⭐️T-shirts are $25 each
⭐️Sweatshirts are $35 each

Feel free to stop in and grab yours during our business hours!

This 6.7 Cummins came in for what was originally thought to be an oil leak coming from the front crank seal.  Turns out,...
09/28/2023

This 6.7 Cummins came in for what was originally thought to be an oil leak coming from the front crank seal. Turns out, the front gear case gasket was leaking, resulting in our first cab removal job on a Ram (Usually it’s Fords that require cab removals 😆).

I’ve seen cab removals numerous times at this point, yet I’m still fascinated every time Ryan does it 🤩, which leads me to using the pictures for a ‼️ PSA ‼️below.

Just this week, it has been brought to our attention by numerous vendors of ours that part strikes have been starting once again. By part strikes, I mean backordered parts, no eta of part arrival, and hubs not providing an abundant amount of parts that are needed by everyone 🚫. We’ve already noticed this with some parts we ordered this week.

We have no idea how quickly this is going to escalate, how long it’s going to last, or how much we will be affected by this (hopefully not as long as the first time 🤞). There are just some things that are completely out of our control, and we can’t do anything about it except to bring it to our customers’ attention.

We ask customers to be mindful of this when scheduling an appointment for their vehicle 🛻 to be worked on. It is important to have a backup plan (spare vehicle, borrow a vehicle from someone, car pool, etc.). Please expect there to be some wait time before we’re even able to get the parts that we need to do the proper repairs on your vehicle. Lastly, all we ask for is your patience and understanding. I promise you, it is just as frustrating for us as it is for you to have to wait for parts.

As always, thank you for your continued business and support! Have a great weekend everyone! ☀️

Been a while since we’ve posted on Facebook.  It’s also been a little while since we’ve had a cab off job here.  So why ...
08/11/2023

Been a while since we’ve posted on Facebook. It’s also been a little while since we’ve had a cab off job here. So why not post about it, right?!

Cab Off Friday 🤩

Replacing the leaky up pipes on a Ford F350 6.4L Powerstroke to end the busy work week here.

Have a great weekend everyone!☀️

Address

N3283 State Highway 57
New Holstein, WI
53061

Opening Hours

Monday 7:30am - 5:30pm
Tuesday 7:30am - 5:30pm
Wednesday 7:30am - 5:30pm
Thursday 7:30am - 5:30pm
Friday 7:30am - 5:30pm

Website

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