Toyota Raum: 1NZ-FE oil consumption on higher-kilometre cars

The 1NZ-FE gives almost no trouble up to about 160,000 km, and then oil consumption starts — caused by piston rings that have stuck in their grooves or valve seals that have hardened with age. It shows up most on longer runs at higher revs, which is exactly the driving that does not happen on the short suburban trips these cars usually do, so an owner may genuinely not know. The engine keeps running well and the car keeps driving normally, which is the trap: the level falls quietly between services, and an engine run low on oil then wears its timing chain faster, which is the other thing this engine does at the same mileage. The two faults feed each other, so finding one means looking hard for the other.

• Oil level well down on the dipstick between services
• Blue smoke from the exhaust, most noticeable on a cold start or when accelerating hard
• Blue puff after the car has idled at lights and then pulls away
• Spark plugs fouling, or the engine running unevenly when cold
• Smell of burnt oil after a longer drive

1. 1

   Check the oil first, on a cold engine standing on level ground, and note exactly where the level sits rather than just that oil is present — near or below the minimum mark is the finding.

2. 2

   Look at its colour and how thin it feels between your fingers.

3. 3

   Then ask the seller directly how much oil the car uses between services and how often they top it up; on a car of this age an honest answer of "about half a litre" is genuinely useful information rather than a red flag by itself.

4. 4

   Watch the exhaust from behind on the first start of the day for a puff of blue that clears, and watch it again after the car has idled a few minutes and is then revved.

5. 5

   On the test drive, get the car onto an open road and hold higher revs for a few minutes, then have someone watch behind as you lift off.

6. 6

   Look at the oil filler cap and the top of the engine for heavy oil residue.

7. 7

   If a workshop inspection is possible: a compression or leak-down test separates stuck rings from valve seals, which cost very differently to put right.

Parts involved: Timing chain.

$700 to $3,000 at New Zealand independent workshop rates. That is for this job on its own, not for the car.

An estimate, in NZD, for the repair as normally carried out. What a specific car costs depends on which part has failed and what it damaged on the way — treat this as the floor for a negotiation, not a quote.

• “How much oil does it use between services?”
• “When was the oil last changed, and how often is it done?”
• “Does it ever smoke on start-up or when you accelerate hard?”

The failure described above is documented in published sources — owner forums, technical service bulletins, recall notices and workshop write-ups — held in our fault database. The inspection instructions and the cost estimate are KickTyres’ own interpretation of them, and it is a starting point for an inspection rather than a manufacturer statement.