The rule of thumb hasn't changed in decades: every 12,000 miles or 12 months, whichever comes first. What has changed is how expensive ignoring it has become — modern engines are less tolerant of old oil than the ones your dad neglected, and a patchy service record now follows a car around forever in its resale value.

The Service Menu, Decoded

• Interim service (£80–£150): oil, oil filter, fluid top-ups, visual inspection. For high-mileage drivers this slots between full services at ~6,000 miles
• Full service (£150–£300): the annual one — adds air filter, comprehensive checks of brakes, suspension, steering and more
• Major service (£300–£500+): every 2–3 years — adds items like spark plugs, fuel filter, brake fluid change, coolant, cabin filter depending on schedule
• The big-ticket scheduled items: cambelt/wet belt (typically every 5–10 years or 60,000–100,000 miles, £400–£1,000) and automatic gearbox servicing. These aren't optional extras — they're the difference between maintenance and gambling

Many newer cars run variable/condition-based servicing — the car monitors oil life and driving style and tells you when it's due. Trust it, but note the ceiling: even a gently driven car should get fresh oil at least every couple of years, because oil ages chemically even when parked.

What Skipping Services Actually Costs

Nothing happens — at first. That's what makes it tempting. Here's the real bill:

• Engine wear compounds quietly. Degraded oil stops protecting long before a warning light knows about it. Turbochargers and timing chains are particularly unforgiving — both four-figure repairs
• Wet-belt engines can be written off by neglect. On engines with oil-immersed timing belts (some Ford EcoBoost, Peugeot/Citroën PureTech), old oil degrades the belt itself; debris then starves the engine of oil pressure. Missed services here aren't a risk, they're a countdown — as we flagged in the service history guide
• Warranties require it. Manufacturer and extended warranties can reject claims on cars serviced late or off-schedule. The £200 you saved voids the £3,000 claim
• Resale pays the final invoice. Buyers discount patchy history hard — often by more than the skipped services would have cost. You don't avoid paying for services; you just pay at the end, with interest

EVs: Less Servicing, Not None

Electric cars delete oil changes, spark plugs, cambelts and exhausts — annual servicing is genuinely cheaper (£100–£200). But they still need: brake checks (regen braking means discs can corrode from under-use), coolant for the battery's thermal system on schedule, cabin filters, and tyres — which EVs eat faster thanks to weight and instant torque.

Your Car Is Already Telling You What's Due

The MOT record is the public half of your car's medical file. Recurring advisories, part-worn items noted year after year, the rhythm of care or neglect — it's all in there. DriveSage's AI reads that history and produces a maintenance forecast: what's likely to need attention in the next 12–24 months and roughly what it'll cost, based on your car's actual wear patterns rather than generic model averages. That turns servicing from surprise bills into a plannable budget.

The Owner's Cheat Sheet

1. Annual service minimum, even on tiny mileage — time degrades oil and rubber as surely as miles do
2. Know your engine's belt situation today — type, interval, and when it was last done. If you can't answer, find out this week
3. Keep every invoice — digital photos are fine. You're building the dossier that sells the car later
4. Independent garages are fine for value (and keep warranties intact if they follow the schedule with approved parts) — consistency matters more than the logo on the invoice
5. Between services: check your oil monthly. Thirty seconds with a dipstick catches the problems that kill engines