Triumph Stag service: key facts
- Oil service every 3,000 miles or 6 months
- Timing chain service: £500–£800 — don't skip this one
- 1 generation from 1970 to 1977
- 5 tracked service items across routine, major, and periodic schedules
Routine service items
These are the items covered in a standard service. Most garages include oil, oil filter and a basic inspection. The rest are typically checked or replaced on a schedule.
| Service item | Interval | Typical cost |
|---|---|---|
|
Engine oil and filter
Classic car specialists recommend 3,000 mile intervals for the alloy V8 engine due to cooling system stress.
MK1
|
3,000 miles or 6 months |
£80–£120
|
Major service items
These are the big-ticket items. Miss them and you risk engine or gearbox damage. The costs are higher but the consequences of skipping are much worse.
| Service item | Interval | Typical cost |
|---|---|---|
|
Timing chain service
Timing chains stretch on the Stag V8. Check tension and guides at 40,000 mile intervals. Replace if rattling present. Timing chain failure can cause valve contact with pistons.
MK1
|
40,000 miles |
£500–£800
|
Has this Triumph Stag been serviced on schedule?
Check the dealer service records to see if the work above was actually done.
£6.99 · Full refund if no records found
Periodic maintenance
Items that don't need doing at every service but should be on your radar at the right mileage or age.
| Service item | Interval | Typical cost |
|---|---|---|
|
Coolant flush
Critical service for overheating-prone V8.
MK1
|
24,000 miles or 2 years |
£150–£200
|
|
Brake fluid
DOT 4 brake fluid every 2 years regardless of mileage. Check brake binding issues common on this model - seized calipers cause brake effort problems visible in MOT data.
MK1
|
2 years |
£60–£90
|
|
Auxiliary belt and tensioner
V-belts on alternator, water pump and power steering. Check tension regularly - loose belts cause charging and cooling problems. Replace as set to maintain proper tension.
MK1
|
20,000 miles |
£80–£120
|
Buying a used Triumph Stag? Check its service history first.
A Stag with a patchy service history can cost you thousands in missed timing belts, skipped oil changes, and hidden neglect. We pull the franchised dealer records — every visit, every stamp, every mileage reading — so you can see exactly what's been done and what's been skipped.
£6.99 · No records found = full refund, zero risk
Related
- Triumph Stag buyer's guide
- Triumph Stag service history check
- Triumph Stag common problems & known issues
- Triumph Stag MOT failure rates
- Triumph Stag car check £7.49
- Free Triumph Stag faults check
- Free MOT failure rate check
- Free car check
- What does "full service history" actually mean?
- How service history affects car values
Triumph Stag service FAQs
How often does a Triumph Stag need servicing?
A Triumph Stag needs servicing every 3,000 miles or 6 months, whichever comes first. Classic car specialists recommend 3,000 mile intervals for the alloy V8 engine due to cooling system stress.
What does a Triumph Stag service cost?
Costs vary depending on the service items required and whether you use an independent garage or main dealer. Independent garages are typically 30 to 50% cheaper for the same work.
Is a Triumph Stag expensive to maintain?
Routine servicing starts from £80 at an independent garage, which is about average for this class of car. The bigger costs come from periodic items like timing belts, brake fluid changes, and transmission servicing. Keeping on top of the schedule avoids expensive failures.
How do I check a Triumph Stag's service history?
You can check any Triumph Stag's official dealer service records online using just the registration number. The check retrieves every logged dealer visit, including dates, mileage, and work done, so you can see whether the schedule has been followed or if there are gaps. It costs £6.99 and you get a full refund if no records are found.