Grayson County Diesel

Grayson County Diesel Grayson County Diesel is your one stop shop for Diesel Service & Repair

24-Valve Cummins in the shop for a FASS installation & some preventative maintenance.🔥While upgrades often get all the a...
06/05/2026

24-Valve Cummins in the shop for a FASS installation & some preventative maintenance.🔥

While upgrades often get all the attention, staying on top of routine services is one of the best ways to keep your truck reliable & ready for whatever comes next.

This visit includes:

✅ FASS Fuel System Installation
✅ Engine Oil & Filter Service
✅ Brake Fluid Service
✅ Cooling System Service
✅ Transmission Service
✅ Preventative Front Engine Repair

Whether it’s a work truck, tow rig, or weekend cruiser, regular maintenance helps extend the life of your truck & catch issues before they become bigger problems.

A little maintenance today can save a lot of downtime tomorrow. 💪

📍 2750 SH- 160, Whitewright TX
📞 903-990-8954

🔍 WHY DIAGNOSTICS MATTER TO US 🔍One of the biggest misconceptions we hear is:“I already know what’s wrong with it.”Somet...
06/04/2026

🔍 WHY DIAGNOSTICS MATTER TO US 🔍

One of the biggest misconceptions we hear is:

“I already know what’s wrong with it.”

Sometimes you’re right.

Sometimes the issue isn’t even close.

At Grayson County Diesel, we don’t believe in throwing parts at a problem & hoping for the best.

Our job is to find the actual cause of the issue.

Proper diagnostics help us give accurate recommendations, prevent unnecessary repairs, & make sure your money is being spent where it needs to be.

We take pride in fixing problems—not guessing at them.

That’s why we diagnose first.

Because the right repair starts with the right diagnosis. 🔧

🚩That $3,000 repair can become a $16,000 repair real fast when the cleanup gets skipped.🚩This Freightliner came to us af...
06/03/2026

🚩That $3,000 repair can become a $16,000 repair real fast when the cleanup gets skipped.🚩

This Freightliner came to us after a high-pressure fuel pump had already been replaced elsewhere. The problem? The fuel system wasn’t properly cleaned & flushed after the original pump failed.

When a high-pressure fuel pump fails, it can send metal contamination throughout the entire fuel system. If those contaminants aren’t removed, they continue circulating & can quickly damage new components.

In this case, metal debris was still present in the fuel lines & rails, leading to the need for a much more extensive repair.

Your truck works hard for a living. Make sure the repairs do too. At Grayson County Diesel, we believe in fixing it right—not fixing it twice. 💪🏼

Give us a call today! 903-990-8954
📍2750 SH 160, Whitewright TX

2019 Ford F-250 6.7 Powerstroke in the shop today getting the attention it deserves!🚨Customer came in after noticing an ...
06/02/2026

2019 Ford F-250 6.7 Powerstroke in the shop today getting the attention it deserves!🚨

Customer came in after noticing an oil leak. After inspection, we traced the concern to the passenger-side valve cover area & we are replacing the valve cover gaskets & seals to correct the leak.

While we’re in there, we’re also replacing the closed crankcase ventilation components & a coolant overflow line to help keep everything sealed up & operating properly.

🔧 Oil leaks don’t fix themselves. A small seep today can turn into a bigger mess tomorrow, leading to oil contamination, damaged components, & costly repairs.

Give Grayson County Diesel a call or stop by the shop & let us take care of it! 👏🏼

📞903-990-8954
📍2750 SH- 160, Whitewright TX

Do You Know What Your Truck’s Smoke Is Telling You? 🚨That Smoke Isn’t a Performance Upgrade.It’s a cry for help!The colo...
06/01/2026

Do You Know What Your Truck’s Smoke Is Telling You? 🚨
That Smoke Isn’t a Performance Upgrade.
It’s a cry for help!

The color, amount, and when it happens all help tell the story. A quick puff on startup is different than a cloud following you down the highway.

If your truck’s been sending smoke signals, let us help figure out what it’s trying to say. 🤝🏼

📍 Grayson County Diesel
📞 903-990-8954

Your wife: “ Turn the A/C up.”Your truck: “ I’M TRYING.”Don’t let an overheating issue ruin your summer. Get your coolin...
05/29/2026

Your wife: “ Turn the A/C up.”

Your truck: “ I’M TRYING.”

Don’t let an overheating issue ruin your summer. Get your cooling system checked before the Texas heat wins.

Call us today & keep your truck running cool & your wife happy all summer long! ❄️💁🏼‍♀️

📍2750 SH 160, Whitewright TX
📞903-990-8954

Customer came in worried his truck was headed for transmission problems after it went into limp mode.After diagnosis, we...
05/28/2026

Customer came in worried his truck was headed for transmission problems after it went into limp mode.

After diagnosis, we found the fuel filter was way past due for replacement & restricting fuel flow. While it’s in the shop, we’re also taking care of some maintenance items to keep this truck running strong:👏🏼

✔️ New fuel filter
✔️ New air filter
✔️ Fresh oil change
✔️ Transmission filter & fluid service

Regular maintenance saves big repairs. Don’t wait until your truck leaves you stranded!

📍2750 SH 160, Whitewright Tx
📞 903-990-8954

05/23/2026

Back at it again with staying stacked with trucks & our techs busy. just how we like it😉 We diagnose & fix it the first time. 👏🏼

Will return to normal hours on Tuesday! Thank you for understanding! Happy Memorial Day Weekend!🇺🇸
05/22/2026

Will return to normal hours on Tuesday! Thank you for understanding! Happy Memorial Day Weekend!🇺🇸

Quick reminder: air filters aren’t lifetime memberships.😐When an air filter gets packed full of dirt, dust, bugs, & debr...
05/20/2026

Quick reminder: air filters aren’t lifetime memberships.😐

When an air filter gets packed full of dirt, dust, bugs, & debris like this, your engine has to work harder to pull in clean air.

A clean air filter helps your truck breathe easier, run smoother, & stay protected for the long haul. Simple maintenance now can save big repairs later. 💁🏼‍♀️

Address

2750 State Highway 160
Whitewright, TX
75491

Opening Hours

Monday 8am - 5pm
Tuesday 8am - 5pm
Wednesday 8am - 5pm
Thursday 8am - 5pm
Friday 8am - 5pm

Telephone

+19039908954

Website

https://certifieddirtyidle.com/

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