New Zealand's #1 mobile mechanic
Pay in 4, with Afterpay
12 month, 10,000km warranty
Affordable, upfront pricingNew Zealand's #1 mobile mechanicPay in 4, with Afterpay12 month, 10,000km warrantyAffordable, upfront pricingCrankshaft Rear Seal/ Rear Main Oil Leak Repair made easy
Enter your cars details to request an estimate for your repair. 🔧
Or choose from hundreds of common repairs here.
New Zealand's #1 mobile mechanicPay in 4, with Afterpay12 month, 10,000km warrantyAffordable, upfront pricingNew Zealand's #1 mobile mechanicPay in 4, with Afterpay12 month, 10,000km warrantyAffordable, upfront pricingCrankshaft Rear Seal/ Rear Main Oil Leak Repair made easy
Enter your cars details to request an estimate for your repair 🔧
Why book with us?
Tell me about my Crankshaft Rear Seal/ Rear Main Oil Leak Repair
The crankshaft rear seal, also known as the rear main seal, prevents engine oil from leaking where the crankshaft exits the back of the engine and connects to the transmission. If this seal fails, oil can leak between the engine and gearbox, leading to oil loss, contamination of the clutch or transmission, and possible engine damage. Repairing or replacing a rear main seal is a complex but essential job for maintaining engine health.
What is a crankshaft rear seal / rear main oil leak repair?
This repair involves removing the transmission to access the crankshaft’s rear seal, removing the worn or damaged seal, and installing a new one. Because of its location, this is a labour-intensive job but vital to stop oil leaks.
Why do you need a rear main seal replacement?
If the rear main seal is leaking, your engine will lose oil. Driving with low oil levels can cause overheating, bearing wear, and catastrophic engine failure. In manual cars, oil leaks may also contaminate the clutch, causing slipping and damage.
Common signs you need a crankshaft rear seal repair
- Oil spots or puddles under the middle of the vehicle
- Visible oil between the engine and transmission housing
- Frequent need to top up engine oil
- Burning oil smell while driving
- Clutch slipping (manual cars) due to oil contamination
- Low oil pressure warning light
What happens during a rear main oil seal repair?
A mechanic will:
- Inspect and confirm the source of the oil leak
- Remove the transmission, clutch, or torque converter to access the seal
- Remove the faulty rear main seal
- Install a new high-quality seal
- Reassemble the transmission and refill fluids
- Test for leaks and confirm proper engine operation
How much does a crankshaft rear seal replacement cost?
Because it requires transmission removal, this repair is labour-intensive. Typical costs range from $900–$1,800+, depending on the vehicle. Costs may be higher if additional work, such as clutch replacement, is performed at the same time.
Is it unsafe to drive with a rear main seal oil leak?
Yes. A leaking rear main seal causes ongoing oil loss, which can lead to low oil pressure and catastrophic engine damage. In manual cars, it can also damage the clutch. The repair should be carried out as soon as possible to prevent further damage.
Frequently Asked Questions 🧐
How do online bookings work for car servicing & basic repairs?
Once you fill out your details, you’ll be shown the ‘search results’ which displays instant fixed-price quotes from local service providers that can be booked online.
Can I get quotes for more complex repairs and inspections?
Yes. Once you have entered in your vehicle details and location, you’ll be able to browse through available repair tasks or inspections that you would like a quote for.
Will the price I'm quoted via Turnersservice.co.nz be the final price I'll pay?
Yes. For the work included in the quote, the price you’re quoted is the final price you’ll pay.
How long will my service or repair take?
If you’ve booked with a workshop, the service provider will usually require your vehicle for the entire day due to scheduling. If you’ve booked with a mobile provider, you will only be without your vehicle for the time it takes to complete the job.
What are my payment options?
Booking your car service or repair through Turners Service & Repairs gives you access to these convenient payment options:
1. Pay upfront and online using your credit or debit card or PayPal
2. Flexible payment options with Afterpay
3. In some instances, you can choose to pay the mechanic when the service or repairs have been completed.
Will I get an invoice at the end of my service or repair?
Yes, we send through a comprehensive report and invoice / receipt once the booking is completed. If you have any questions please reach out via 0800 768 000.
