Talk to us on LINE
Cause before parts
Read the values, listen to the engine, then conclude
From filters and hoses to reducers, injectors and tanks, we tell you the work and the price before starting, every time.
LPG and NGV vehicle service
Gas car feeling a little off? Let us listen first
Heavy gas use, weak acceleration or a warning light. We find the cause first, then suggest what should be done.
Fully licensed
You do not need every part replaced. You need to know what is really wrong
One symptom can have many causes, and guessing wastes both money and time. We start by reading values and checking the car, then explain before you decide.
Fully licensed
Handled by a licensed operator
Check the document number and expiry date below.
- LPG installation, cars
- Number
- ตปร/สป 04-2567
- Licence holder
- Weewin International Business Co., Ltd.
- Valid until
- 15 Nov 2027
- LPG installation, transport vehicles
- Number
- ตปข/สป 01-2567
- Licence holder
- Weewin International Business Co., Ltd.
- Valid until
- 12 Dec 2027
- CNG installation
- Number
- ตธร/สป 02-2569
- Licence holder
- Weewin International Business Co., Ltd.
- Valid until
- 8 Jun 2029
Numbers and expiry dates are as shown on the documents held by each company.
Care for the whole car
Fitted elsewhere? You are still welcome
NGV work, engine oil, coolant, spark plugs and coils can be handled in one visit, so you do not need several garages.
If you smell gas: park in the open, switch off, close the valve, and call us.
Talk to us on LINEGood to know
Does your car have these symptoms?
One symptom can have several causes, so we check before recommending parts.
Smell of gas
Park in the open, switch off, close the valve, avoid sparks and call a technician.
Hard starting or weak acceleration
We start with the filter, reducer, injectors, coils and tuning.
Using too much gas
We check the tuning, injectors and system leaks.
Warning light
We read the control unit before deciding what has failed.
What service work do we do?
- Gas filters, hoses and valves
- Reducers, injectors and tanks
- Leak checks, tuning and control unit readings
- NGV cars and systems fitted elsewhere
- Engine oil, coolant, spark plugs and coils
System check: ask for a quote · Filter: ask for a quote. We confirm the price before every job.
Real reviews on Google
Reviews from our customers
4.8 stars from 1,143 Google reviews (as of 4 Nov 2026) · All reviews on Google
★★★★★
Came to change the gas filter. Good, quick service.
★★★★★
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.
★★★★★
Excellent service, with very good care after installation. For car gas, it has to be Mongkol Gas.
★★★★★
Good, fast service. This is my second visit. I had the gas fitted elsewhere but came to have Mongkol look after it, and got excellent service. Fair prices, trustworthy.
★★★★★
Came today for a gas check at 20,000 km after installation. Got good advice from the staff, all of them lovely.
★★★★★
There aren't many places left that repair NGV this sincerely and seriously, to a standard you can trust, at a fair price. You can relax here: a waiting room with cool air-con, drinks, and coffee too. Office people will find it comfortable.
★★★★★
Came to have my gas re-tuned. Good service as always, and the young staff are lovely.
★★★★★
Had it installed here and they keep looking after it long-term. No problems in use. I come to replace the engine oil, filter and rubber hoses as they reach their service life.
★★★★★
Good service. Fixed my gas problem for good.
★★★★★
The gas system is good and the service is very good. They help as much as they can. Some problems may come from my own car, but I still always come here.
Frequently asked questions
What should I do if I smell gas?
Park in the open, switch off, close the tank valve, avoid sparks and call a technician.
Can I check for leaks myself?
Soapy water on joints can show bubbles, but a technician should also check with instruments.
Why does my gas car accelerate poorly?
It may be a blocked filter, reducer, injectors, coils or tuning. It needs checking first.
When should the gas filter be changed?
It depends on the kit and use. A technician can advise the right interval.
What are signs of a bad reducer?
Higher gas use, stumbling or a gas smell. It should be confirmed before replacement.
Do you repair systems fitted elsewhere?
Yes. Send the car model and kit brand first.
Can you replace the tank?
Yes, including the certificate and tank data.
Do you still repair NGV?
Yes, and we can advise if you want to switch to LPG.
Related services
LPG installLPG injection fitted with care, and a look at your PT programme eligibility.Gas inspectionLPG and NGV system checks, so the car is ready to drive and ready for road tax.InspectionYearly inspection for cars and motorcycles, then road tax right after.Tax calculatorEnter your vehicle details to see the amount.
When you are ready
Describe the symptoms to us first
Send a clip or a photo of the warning light on LINE and a technician will give initial advice before you bring the car in.
LINE
Opening hours
Mon–Sat 08:00–18:00
299/11 Moo 5, Srinakarin Road, Bang Mueang, Mueang Samut Prakan, Samut Prakan 10270, Thailand