MajorCommonTransmission

Renault Koleos: CVT (X-CVT) slipping, whine and oil-cooler coolant intrusion

CVT (X-CVT) slipping, whine and oil-cooler coolant intrusion is a common transmission fault on the Renault Koleos on the 2008–2016 cars, and we rate it major. Putting it right costs $3,000 to $7,000 at New Zealand independent workshop rates. Below is what goes wrong, the symptoms to notice on a test drive, where to look, and what to ask the seller before you hand over any money. It is one of 17 documented faults on the Renault Koleos.

Vehicle: Renault Koleos
Engine: 2.5L
Years: 2008–2016
Fuel: petrol
Gearbox: cvt
System: Transmission

This page covers the Renault Koleos as a model. Some faults only affect particular engines or build years — enter a plate below to narrow the list to one car.

All Renault Koleos faults17 documented faults on this model

What you are looking at

No photograph available

We do not hold a verified photograph for this fault yet. We would rather show none than show a picture of something else.

What goes wrong

The 2.5 petrol Koleos uses a CVT (shared with Nissan) that can start slipping, whining or delaying drive from around 100,000 km, particularly with stop-start city use and old fluid. A specific known failure is the transmission oil-cooler letting engine coolant into the CVT fluid, which contaminates it and destroys internal parts. Fresh fluid at intervals helps, but a slipping or noisy CVT is a major repair or replacement.

What you would notice

Slipping or flaring revs without acceleration
Whining or humming that rises with speed
Jerky or delayed take-up from a stop
Shudder under light throttle

How to check it

Where to look. CVT transmission and its oil cooler at the front of the car

On the drive accelerate gently from rest and at motorway on-ramp speed, feeling for slip (revs rising without the car pulling) and listening for a whine. Ask when the CVT fluid was last changed and whether the transmission cooler has ever caused coolant/fluid mixing. Milky transmission fluid is a warning.

What it costs to put right

$3,000 to $7,000 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.

Ask the seller

“When was the CVT fluid last changed?”
“Has the transmission ever slipped, whined or had the oil cooler replaced?”

Now check the Renault Koleos you are actually looking at

Everything above is true of the model, and it is free. What it does not tell you is whether THIS car has been looked after: its odometer history and whether the reading has ever gone backwards, whether there is still money owing on it, whether it has been reported stolen, how many owners it has had and what it is really worth today. That comes from the official records for that plate. Enter the plate for the free details, or get the full history and a market valuation from $13.49.

Not sure what you would be paying for? See what a full KickTyres check includes.

Where this comes from

The failure described above is documented in the sources below. The inspection instructions and the cost estimate are KickTyres’ own interpretation of them.

AUTODOC – 'Renault Koleos: common problems and faults' (CVT/X-CVT)
MotorHub – 'Renault Koleos 2017-2025 Reliability Guide' (CVT symptoms)

Renault Koleos buyer questions

Is cvt (x-cvt) slipping, whine and oil-cooler coolant intrusion serious on a Renault Koleos?

We rate it major and common on the Renault Koleos. The 2.5 petrol Koleos uses a CVT (shared with Nissan) that can start slipping, whining or delaying drive from around 100,000 km, particularly with stop-start city use and old fluid. A specific known failure is the transmission oil-cooler letting engine coolant into the CVT fluid, which contaminates it and destroys internal parts. Fresh fluid at intervals helps, but a slipping or noisy CVT is a major repair or replacement.

How much does it cost to fix on a Renault Koleos?

$3,000 to $7,000 at New Zealand independent workshop rates. That figure is for this job on its own. A car showing the symptoms on this page is usually worth either walking away from or negotiating down by at least the repair figure.

Which Renault Koleos years are affected?

Our research records this fault on the 2008–2016 Renault Koleos. Build dates move around, especially on imported cars, so treat the range as the years to look hardest at rather than a guarantee either way. The official records tell you the exact build and first registration date for the car in front of you.