
One visit
Come once, leave with everything settled
Gas check, inspection, compulsory insurance and road tax can all happen in one visit, so you never have to remember which paper goes where.

Mongkol Auto Services · Srinakarin Road
Inspection, gas checks, road tax and insurance, with no driving between offices, so your day keeps its time for what matters more.
Fully licensed






An inspection here, road tax there, insurance on another call. Small tasks quietly take over a day off. That is why, since 2005, we have kept all of it under one roof.
What brings you here

Yearly inspection for cars and motorcycles, then road tax right after.

LPG and NGV system checks, so the car is ready to drive and ready for road tax.

LPG injection fitted with care, and a look at your PT programme eligibility.

We find the cause first, then fix what actually needs fixing.

Road tax, compulsory insurance and registration work, without the trip to the DLT.

Every class of cover compared for your car and your budget.
Fully licensed
Vehicle inspection, gas inspection, gas installation and insurance brokerage are all in our group, so work continues here with no hand-offs.






Numbers and expiry dates are as shown on the documents held by each company.

One visit
Gas check, inspection, compulsory insurance and road tax can all happen in one visit, so you never have to remember which paper goes where.

Gas car know-how
We began by fitting gas systems and were founded by a mechanical engineer. We can explain where a problem lies, and tell you the work and the price before we start.
Road tax calculator
Our own calculator. Enter your vehicle details to see the amount.
Open the calculator
While we look after the car, you can sit in the air-conditioned lounge with a coffee and carry on with your day.
Talk to us on LINEReal reviews on Google
4.8 stars from 1,143 Google reviews (as of 4 Nov 2026) · All reviews on Google
I come for my car inspection every year. Convenient, close to home, good service and polite staff.
I come for inspection and registration renewal every year. Staff and technicians give good, fast service. Recommended.
I have used Mongkol for vehicle inspection for several years. Good service, a clean customer area and polite staff.
Brought the car for inspection, NGV gas check and road tax, all done in one place. Convenient and quick.
Brought my car for inspection and the annual gas tank check to renew road tax. The service here is very friendly. :)
This is my second visit. The first time I came to ask about the car gas tank system and got very good advice. My tank was extended for 5 more years as the system and tank are in very good condition, never hit or knocked. So I came back for inspection, and I will keep coming.
This is my second car with gas fitted here. All tidy, no problems. You can sit or lie down and wait at the shop all day.
Took my Accord G8 for installation and road tax together. Convenient, and the installation kept to plan. I have used it for 3 weeks with no problems. The waiting room has enough space, and food is a short walk away at the PTT station. Recommended.
My first car had gas fitted here, and so did my second. Anyone wanting gas can trust Mongkol Auto Services. Good service and good standards.
Came to change the gas filter. Good, quick service.
Everything was good overall, especially the repair technician, who explains very well. That is why this is my third time here.
Excellent. Several other places could not find the problem, but at Mongkol the symptom was completely gone, and it saves a lot of gas too.
My second visit. Very complete: vehicle inspection, gas system inspection and road tax. Came before noon and got the disc that evening.
Compulsory insurance and road tax done quickly. Staff speak politely. Good service.
Convenient: one place for registration renewal, compulsory insurance and insurance. An air-conditioned room and not a long wait.
I have been coming for about 7 years. The location is easy to reach and easy to spot. Road tax, inspection, insurance renewal and more all have good service. The lounge is comfortable and the staff are lovely.
Good service. I always come here for road tax, inspection and insurance.
I brought my Honda City for LPG here. Good service with free service throughout. I also did compulsory insurance and car insurance here. Complete, all in one place.
Worth knowing

Cars need an annual inspection from 7 years after first registration; motorcycles from 5 years.

Fix the issue and return to the same station within 15 days to pay half the fee.

You need a mechanical engineer certificate, drawings, calculations and an engineer-with-vehicle photo.

LPG and NGV vehicles need an annual gas certificate before renewing road tax.

Not always: passing the test extends it by 5 years.

NGV stations have fallen to 257 and NGV costs about 20 baht/kg.

A discount on LPG installation in return for a minimum monthly fill at PT stations for 36 months.

Compare online renewal, the transport office and agent service.

The fine is 1% per month; over 1 year requires a transport office inspection.

Apply at a transport office with your registration book and ID, or ask us to handle it.
When you are ready
Tell us your car model and what is on your mind, and we will tell you what to prepare.
Mon–Sat 08:00–18:00
299/11 Moo 5, Srinakarin Road, Bang Mueang, Mueang Samut Prakan, Samut Prakan 10270, Thailand