Porsche 928 Service Schedule: Intervals, Costs & What's Critical

Porsche 928 service: key facts

Oil service every 6,000 miles or 1 year
Basic service costs £80–£250 depending on garage
Timing belt and tensioner: £800–£1200 — don't skip this one
1 generation from 1987 to 1995
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 Porsche recommends 6,000 miles or annually. 928	6,000 miles or 1 year	£80–£120 Dealer: £180–£250

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 belt and tensioner Critical service - interference engine will suffer valve damage if belt fails. 928	60,000 miles or 4 years	£800–£1200 Dealer: £1800–£2500
Automatic transmission fluid Most 928s have automatic transmission. Change fluid and filter every 60,000 miles. Use Dexron III specification. Failure to service leads to valve body problems and transmission failure. 928	60,000 miles or 5 years	£200–£350 Dealer: £450–£650

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
Brake fluid Replace every 2 years regardless of mileage. Brake fluid absorbs moisture over time reducing effectiveness. Use DOT 4 specification only. 928	2 years	£60–£90 Dealer: £120–£180
Coolant flush Replace coolant and flush system every 4 years. Do at same time as timing belt service. Check for corrosion in aluminium radiator and engine block. Use Porsche-approved coolant only. 928	60,000 miles or 4 years	£150–£250 Dealer: £300–£450

Known issues to watch for

The most common problems reported on the Porsche 928, ranked by severity.

dangerous

Brake hose corrosion and ferrule failure (928)

MOT data shows 928s fail brake hose ferrule corrosion tests at 4.9 times the national average.

dangerous

Timing belt failure and valve damage (928)

The 928 uses an interference V8 engine where timing belt failure causes catastrophic valve and piston damage.

major

Wheel bearing failure at high mileage (928)

MOT data shows 928s fail wheel bearing tests at 9 times the national fleet average, particularly on high-mileage cars.

major

Excessive fluid leaks from engine and transmission (928)

MOT data shows 928s fail environmental fluid leak tests at 8 times the national average.

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

Check a Porsche 928's service history

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Porsche 928 service FAQs

How often should a Porsche 928 be serviced?

A Porsche 928 should have an oil service every 6,000 miles or 1 year, whichever comes first. Porsche recommends 6,000 miles or annually.

How much does a Porsche 928 service cost?

A basic service at an independent garage typically costs £80–£120. Main dealer servicing is usually £180–£250. Major items like timing belts or gearbox services cost significantly more.

Can I service a Porsche 928 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.

Porsche 928 Service Schedule & Costs