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MG B Gt Service Schedule & Costs

Every service item for the MG B Gt — what needs doing, when, and what it should cost at an independent garage versus a main dealer.

MkI (1965–1974)B-Series 1.8
MkII (1974–1980)B-Series 1.8

MG B Gt service: key facts

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 itemIntervalTypical cost
Engine oil and filter
Period recommendation was 3,000 miles or 6 months.
MkI, MkII
 3,000 miles or 6 months
£45–£75
Air filter
Replace annually or every 12,000 miles. K&N washable filters are popular upgrade. Dirty air filter directly affects mixture strength and emissions on SU carburettor cars - crucial for MOT compliance.
MkI, MkII
 12,000 miles or 1 year
£15–£25

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 itemIntervalTypical cost
Gearbox oil
Change every 25,000 miles or when contaminated.
MkI, MkII
 25,000 miles
£25–£45

Periodic maintenance

Items that don't need doing at every service but should be on your radar at the right mileage or age.

Service itemIntervalTypical cost
Spark plugs
Period recommendation was 12,000 miles.
MkI, MkII
 12,000 miles or 2 years
£25–£40
Brake fluid
Change every 2 years regardless of mileage due to moisture absorption.
MkI, MkII
 2 years
£35–£55
Coolant flush
Flush cooling system every 3 years.
MkI, MkII
 3 years
£40–£70

Known issues to watch for

The most common problems reported on the MG B Gt, ranked by severity.

dangerous
Structural corrosion compromising vehicle rigidity
The MG B GT uses a monocoque steel construction without a separate chassis, making structural corrosion particularly serious.
major
Excessive emissions failing MOT limits
Cars built before emissions regulations struggle to meet modern MOT emissions standards, particularly carbon monoxide and hydrocarbon limits.
major
Suspension bush and joint wear
The MG B GT uses rubber bushes throughout its suspension system that deteriorate with age regardless of mileage.
major
Wheel bearing wear and failure
Wire wheel MG B GTs use knock-on wheel hubs with taper roller bearings that require regular adjustment and maintenance.

1 more known issues tracked. Check a specific car's history to see what matters for its age and mileage.

Check a MG B Gt's service history

Enter a reg to see franchised dealer service records — dates, mileage, and work done at every visit.

Check service history

£6.99 · Full refund if no records found

Related

MG B Gt service FAQs

How often should a MG B Gt be serviced?

A MG B Gt should have an oil service every 3,000 miles or 6 months, whichever comes first. Period recommendation was 3,000 miles or 6 months.

How much does a MG B Gt service cost?

Costs vary depending on the service items required and whether you use an independent garage or main dealer. Independent garages are typically 30-50% cheaper.

Can I service a MG B Gt at an independent garage?

Yes. Under UK consumer law, using an independent garage does not void your manufacturer warranty, provided they use parts meeting the manufacturer's specification and follow the correct schedule. However, independent services won't appear in the franchised dealer digital records.