1985 Autocar: we work on any truck
If it runs diesel and needs help, we'll show up. Age is not a barrier: classic, vintage, or modern.
Mobile Oil Change & PM
Mobile Truck Oil Change & PM Service in Charleston, SC
Oil and filters, fuel filters, air filter, chassis grease, fluid checks, DEF, and a walkaround inspection for semi trucks, box trucks, diesel pickups, vans, and equipment, done at your yard or jobsite. You get a written record of what was done and anything we found.
- Oil, fuel and air filters, chassis grease, fluids, DEF, and inspection items
- Oil and filters matched to your engine maker's spec and your duty cycle
- Charleston, North Charleston, Summerville, Goose Creek, Mount Pleasant
What a Mobile PM Covers
The service your truck gets without leaving the yard
Oil & filters
Oil drained and refilled to your engine maker's grade and spec, with new filters. We look at what drains out for obvious signs of coolant, fuel, or metal.
Fuel filters & water separator
The primary filter and its water separator bowl, plus the engine-mounted secondary filter that catches the fine particles. We drain the separator and tell you if water keeps showing up.
Air filter, grease & fluids
Air filter restriction checked and the element replaced when it is due. Chassis grease at every fitting, and transmission, differential, and power steering levels checked and topped off.
DEF, coolant & inspection
DEF level and the DEF filter when due, a coolant strength and additive test, and a walkaround of brakes, tires, lights, belts, hoses, and air lines.
Signs It's Due
Don't wait for a warning light to schedule it
A water-in-fuel light, a climbing air filter restriction gauge, hard starting after the fuel filters have gone long, or a DEF warning on a truck that sits a lot are maintenance items showing up as symptoms. A DEF filter can clog early on units that sit, run in heat, or get poor-quality DEF. Conventional coolant uses up the nitrite that protects the cylinder liners, so it needs a test strip and additive, not just a top-off.
There is no single correct oil interval. It depends on the engine maker, the oil spec, and the duty cycle. A linehaul tractor getting good mileage goes much longer between drains than a dump truck, a stop-and-go box truck, or a unit that idles for hours. We follow the interval in your engine maker's maintenance guide for your duty cycle and tell you if the way the truck runs puts it in the severe-service column.
This page is for owner-operators and small operations that need one truck or a few serviced when they come due. If you want every unit on a set schedule with records kept for you, see our fleet repair and maintenance and fleet preventive maintenance contracts pages.
Why operators call us
- Mobile service where the truck is sitting
- Testing before parts replacement
- Clear written findings and next steps
- Commercial diesel and fleet-focused support
- 24/7 Charleston-area availability
How a Mobile PM Visit Works
From your text to a written service record
1. Send the unit details
Year, make, engine, mileage or hours, and the last service date. That lets us match oil and filters to the engine before the visit.
2. Service where it's parked
We set up at your yard, lot, or jobsite. The truck stays where it works instead of being driven across town and back.
3. Drain and look
The oil comes out first so we can look it over for obvious coolant, fuel, or metal while the old filters come off.
4. Filters, grease, fluids
New oil, fuel, and air filters as due, chassis grease, fluid levels, DEF, and a coolant test.
5. Walkaround inspection
Brake linings and pushrod travel, tire condition, lights, belts and hoses, air leaks, and any fresh leaks under the engine.
6. Written record
What was changed, at what mileage or hours, and what needs attention next. 49 CFR 396.3 requires systematic maintenance but leaves intervals to the carrier, so dated records matter.
Truck due for an oil change or PM?
Text the year, make, engine, mileage or hours, and where the truck is parked. We'll set up the service at your location.
Common mobile oil change and PM questions
How often does my truck need an oil change?
It depends on the engine maker, the oil spec, and the duty cycle. Low fuel mileage, heavy idle time, and vocational work all shorten the interval, and medium-duty engines usually run shorter than big on-highway engines. We follow your engine maker's maintenance guide for the way your truck actually works.
Can you change the oil at my yard or jobsite?
Yes. All of our work is done on-site, at your yard, lot, jobsite, or home base. We just need safe access and a reasonably level spot to reach the drain plug and filters.
What does a PM visit include besides the oil?
Fuel filters and the water separator, the air filter when due, chassis grease, fluid levels, DEF, a coolant test, and a walkaround of brakes, tires, lights, belts, hoses, and air lines, all on a written record.
What happens if the PM turns up a problem?
Small items like a loose clamp, a dead marker light, or a leaking air fitting can often be handled during the visit. Bigger findings, such as worn brake linings or a weeping water pump, go on the written record with a clear recommendation. If a part has to be ordered, we come back to install it where the truck is parked.
Do I need a fleet contract to book a PM?
No. This service is for one truck or a few, booked when they are due. Fleet maintenance contracts cover every unit on a set schedule. Call or text (843) 310-0995 either way.
Request a Mobile Oil Change or PM
Tell us what the truck is, where it's parked, and when it was last serviced. If the truck is already down, calling or texting is best.
Several units due at once? Call or text (843) 310-0995.
Recent Repair Photos
A look at the repairs we make
Real field photos from Lowcountry Diagnostics, from engine diagnostics and electrical to hydraulic, HVAC, and heavy-duty truck service, handled on-site across the Charleston area.
Reviews
What Charleston truck owners and fleets say
“Very reliable.. very transparent.. good service .. I would highly recommend and will be calling him again”
“Great communication, service and transparency.”