How often should I change my oil?

Follow the interval in your owner's manual or the car's oil-life monitor. On modern engines running full synthetic that is commonly between 5,000 and 10,000 miles, or 12 months, whichever comes first. The 3,000-mile rule is a holdover from conventional oil and older engines. Short-trip, towing, dusty or extreme-temperature use puts you on the severe schedule, which is typically the shorter end of the range.

What is done at a 60,000 mile service?

Typically: oil and filter, engine and cabin air filters, a brake fluid change, transmission fluid on many vehicles, coolant on some, spark plugs on cars with copper or platinum plugs, plus a full inspection of brakes, suspension, belts and hoses. The exact list is model-specific — the manual's schedule is authoritative, not the menu board at the shop.

Do maintenance items expire by time as well as mileage?

Yes, and this catches low-mileage drivers out. Oil degrades by oxidation and fuel dilution whether or not the car moves, brake fluid absorbs moisture from the air, tires age out at roughly six to ten years regardless of tread depth, and 12V batteries typically last three to five years. Every reminder should therefore carry both a mileage and a date, whichever lands first.

Does skipping dealer service void my warranty?

In the United States, the Magnuson-Moss Warranty Act means a manufacturer generally cannot void your warranty merely because you had maintenance performed elsewhere or used aftermarket parts. What they can require is that the scheduled maintenance was actually done — which is why dated receipts and a service log matter. Keep the records and you keep the leverage.

What is severe service?

Most manuals define a severe or heavy-duty schedule for short trips under about five miles, extended idling, stop-and-go traffic, towing, mountainous terrain, dusty conditions, or very hot or cold climates. A surprising share of ordinary commuting qualifies. If your driving fits, use the shorter intervals.

Car Maintenance Schedule by Mileage: 30k / 60k / 90k Checklist

Read this first

Your owner's manual outranks this page, every dealer's menu board, and every article on the internet. Intervals differ enormously between a direct-injection turbo four, a hybrid, and a naturally aspirated V6 — and between a car driven 300 highway miles a week and one that does four cold-start miles a day. What follows is the shape of a typical modern schedule and, more usefully, why each item is on it, so you can read your own manual with a sharper eye.

Every oil change: the five-minute pass

Whatever your interval is — 5,000, 7,500, 10,000 miles — the oil change is also the moment the car is on a lift with someone looking at it. Make that count:

Oil and filter to the manual's grade and viscosity. The viscosity spec is not a suggestion on modern variable-valve-timing engines; the oil is a hydraulic fluid as well as a lubricant.
Tire pressure to the doorjamb placard, not the number on the tire sidewall (that is a maximum, not a target).
Tire rotation — usually every other oil change, and the cheapest tread-life extension available.
Fluid levels: coolant, brake, washer, power steering if hydraulic.
Visual check: belts, hose softness, weeping seals, brake pad thickness, wiper condition, lights.

Log the odometer reading every time. Two years from now, the question "when did we last do the brake fluid?" has an answer, and that answer is worth money when you sell — see what records do to resale value.

30,000 miles

The first real service milestone. Most of it is filters and fluid checks — cheap, quick, and the point where neglect starts compounding.

Item	Why now	Typical DIY difficulty
Engine air filter	Restricted intake costs power and, on some engines, fuel economy. Sooner in dusty or rural driving.	Easy — usually clips, no tools
Cabin air filter	Weak airflow and musty smell are the symptoms. Frequently skipped for years.	Easy — often behind the glovebox
Brake inspection	Pads on many cars are near half-life here. Measuring now avoids scored rotors later.	Moderate
Brake fluid test	It is hygroscopic — moisture content rises with age, and boiling point falls with it.	Test easy, flush moderate
Transmission fluid (some)	Many CVTs and some automatics specify a first service around here. "Lifetime fluid" claims are optimistic on a car you intend to keep.	Shop on most vehicles
Alignment check	Uneven wear across a tire's width is cheaper to fix now than at the next tire purchase.	Shop

60,000 miles

The expensive one, and the one worth budgeting for in advance. This is where fluids that were genuinely fine at 30k are genuinely not fine anymore.

Item	Why now
Everything from 30k	Filters again, brakes again, rotation and alignment.
Brake fluid flush	If it was not done at 30k, it is due. Two- to three-year intervals are common regardless of mileage.
Transmission fluid	The single most consequential deferred item on this list. A fluid service is a fraction of a rebuild.
Spark plugs (copper/platinum)	Iridium plugs commonly run to 100k+; older plug types are due around here. Check what your engine uses.
Coolant (some)	Long-life coolants often specify a first change between 60k and 100k, or five years.
Tires	Many all-seasons are at or past tread life. Check the DOT date code too — see the time-based section.
Battery	Three to five years is typical life. Test it before winter rather than after a no-start.
Suspension	Struts and shocks fade gradually enough that you stop noticing. A bounce test costs nothing.

Budget note

The 60k service is where "cheap to run" cars and expensive ones separate. If you are shopping used, look up the 60k and 90k service costs for the model before you buy — it is a bigger long-run number than the price difference between two listings, and a car with those services already documented is worth paying for.

90,000 miles

Repeat the 30k list, plus anything the 60k service deferred.
Timing belt, if your engine has one — commonly specified between 60k and 105k, or by age. On an interference engine, a snapped belt is engine-destroying. If you do not know whether your engine has a belt or a chain, that is the single most valuable thing to look up today.
Water pump and tensioner, typically replaced with the timing belt because the labour is already paid for.
Coolant, if not done at 60k.
Spark plugs, if not done at 60k.
Serpentine belt, and check the tensioner and idler pulleys while it is off.
Fuel filter, on vehicles where it is a serviceable item rather than in-tank and lifetime.
Differential and transfer case fluid, on AWD and 4WD vehicles — often forgotten entirely and cheap to service.

100,000 miles and beyond

Past 100k the schedule stops being a calendar and starts being condition-based. The car will tell you what it needs if you are keeping records; without them you are guessing.

Iridium spark plugs come due around here on most modern engines.
Coolant, on the long-life schedules that stretched to 100k.
Oxygen sensors degrade rather than fail outright. A lazy upstream sensor is a classic quiet cause of a 5–10% fuel-economy loss.
Suspension bushings and mounts — the "it just feels older" items.
PCV valve, throttle body cleaning, and on direct-injection engines, intake valve carbon. DI engines do not wash their intake valves with fuel; walnut blasting at 80–120k is a known maintenance item on several platforms.
Automatic transmission fluid at whatever interval you settled on. Consistency beats theory here.

The time-based items nobody schedules

Mileage-based reminders quietly fail low-mileage drivers. These items expire on the calendar:

Item	Typical time limit	What goes wrong
Engine oil	12 months	Oxidation and fuel dilution proceed regardless of miles; short trips never boil the moisture out.
Brake fluid	2–3 years	Absorbs atmospheric moisture; boiling point drops and internal corrosion begins.
Tires	6–10 years	Rubber hardens and cracks with age. Read the DOT code: the last four digits are week and year of manufacture.
12V battery	3–5 years	Capacity fades; failure is usually sudden and at the worst temperature.
Wiper blades	6–12 months	Rubber hardens with UV and heat. Cheap, and directly a safety item.
Coolant	5 years typical	Corrosion inhibitors deplete before the coolant stops cooling.

Why reminders need both numbers

"Every 6,000 miles" fails the driver who does 3,000 miles a year. "Every 6 months" nags the driver who does 25,000. A reminder should carry both a distance and a date and fire on whichever arrives first. That is how manufacturers write their schedules, and it is how Carvico's reminders work — every one has a mileage interval, a time interval, or both.

Severe service: are you on it?

Nearly every manual has two schedules, and most people assume they are on the normal one. Read the severe-service definition — it usually includes:

Trips shorter than about 5 miles, especially in cold weather (the engine never reaches full operating temperature, so moisture and fuel stay in the oil)
Extended idling or heavy stop-and-go traffic
Towing, roof loads, or carrying heavy cargo
Mountainous or hilly terrain
Dusty, gravel, salted, or sandy roads
Sustained very hot or very cold ambient temperatures

A short suburban commute in a place with real winters ticks two or three boxes. If that is your driving, the severe schedule is not paranoia — it is the schedule the engineers wrote for you.

Real interval or upsell? Four questions

Shops are not villains, but a service advisor's menu is a sales document, not a maintenance schedule. Four questions sort it out quickly:

"Can you show me where that's in the manufacturer's schedule?" Genuine interval items are printed. Engine flushes, fuel-system cleanings, and most "protection packages" are not.
"What does the measurement say?" Brake pads have a thickness in millimetres. Fluid has a test strip or a moisture reading. Ask for the number, not the adjective.
"What happens if I do it next visit?" A real answer distinguishes "nothing, but don't forget" from "this is why the transmission fails at 120k."
"When was it last done?" The one you should be able to answer yourself. A driver who says "18,400 miles ago, in March" is treated differently from one who shrugs — including at trade-in.

Tracking it without a spreadsheet you'll abandon

The best schedule is the one that survives contact with a busy year. Three approaches, honestly compared:

Method	Holds up when	Fails when
Glovebox notebook	You are disciplined and keep one car a long time.	It gets wet, gets lost, or sells with the car — and it cannot remind you of anything.
Spreadsheet	You like formulas and already live in one. Free template here.	You are at a pump with a phone in one hand. Entry friction is what kills spreadsheets, not capability.
Phone app	Logging takes seconds and reminders find you. Dual mileage-and-time reminders are the feature to insist on.	The app is abandoned, holds your data hostage, or sells it. Check that CSV export exists before you commit years to it.

Whichever you choose, the test is simple: could you hand a complete, dated history to a mechanic or a buyer tomorrow? If not, the system is decorative.

Questions

Is the 3,000-mile oil change dead?

For modern engines on full synthetic, yes — it is a holdover from conventional oil in older engines. Follow the manual or the oil-life monitor. The exception is genuinely severe use, where shorter intervals are the manufacturer's own recommendation.

Does using an independent shop void my warranty?

In the US, the Magnuson-Moss Warranty Act generally prevents a manufacturer from voiding warranty coverage simply because service was done elsewhere or with aftermarket parts. What they can insist on is proof the scheduled maintenance actually happened. Keep dated receipts and a service log; that record is the whole ballgame in a warranty dispute.

What if I bought the car used with no records?

Reset the clock: do the fluids you cannot verify (oil, brake fluid, transmission, coolant), then start logging from that day. Two years of documented history from a known baseline is worth far more at resale than a shrug about the first 80,000 miles.

Do EVs have a maintenance schedule?

A shorter one, not an empty one: tires (which wear faster under instant torque and extra weight), brake fluid, cabin filter, coolant for the battery and power electronics on many models, and 12V battery. Regenerative braking means friction pads last a long time — which makes seized calipers from disuse a real thing worth inspecting for.

How much should I set aside per year?

Do it per mile rather than per year, and use your own history once you have some. The method is in the cost-per-mile guide — a maintenance-and-repair figure derived from your own records beats any national average, because it prices your car, your climate, and your shop.

Reminders that use miles and months

Carvico turns any service into a reminder in one tap — 5,000 miles or 6 months, whichever lands first — with a colour-coded due list and a PDF service report you can hand to a mechanic or a buyer. Free for one vehicle, no account needed.

Download on theApp Store

Keep reading

Resale

What service records are actually worth

What a documented history does to a dealer appraisal and a private sale — without the invented percentages.

Template

Free car maintenance log template

A CSV that opens in Excel, Numbers or Sheets — and imports straight into an app when the spreadsheet gets old.