Parts for your 2018 Mitsubishi Eclipse cross-Oil seals

2018 Mitsubishi Eclipse Cross oil seals — what they do and when to replace

Oil seals are absolutely fitted to the 2018 Mitsubishi Eclipse Cross. Mitsubishi Motors’ Workshop Manual for the 2018 model (engine and transaxle sections) and the Mitsubishi ASA electronic parts catalogue both list multiple seals, including front and rear crankshaft oil seals, camshaft seals, and transaxle/driveshaft output shaft seals. AWD variants also add transfer case/differential seals. So they’re relevant to every Eclipse Cross on Aussie and Kiwi roads.

What do they do? Oil seals keep engine or transmission fluid where it belongs, and stop dirt and water from sneaking in. On the 1.5L turbo (4B40) engine and its CVT transaxle, these elastomer lip seals ride on rotating shafts (think crank, cams, and drive shafts) with a tiny spring maintaining contact pressure. Good seals mean stable oil levels, clean driveline components, and less mess on the driveway.

They’re not a scheduled “replace-by-date” item, but they do wear. The workshop-friendly approach is to check them at regular servicing (typically every 15,000 km or 12 months):

• Look for weepage behind the crank pulley/timing cover, at the bellhousing (rear main), and around CV output flanges.
• Watch for oil drops under the car, a burnt-oil smell on hot components, or an unexplained oil level drop.
• For AWD, inspect the transfer and rear diff input/output seals for misting.

If a seal leaks, replacement is the fix. It’s smart to combine the job with related work to save labour — for example, doing the front crank seal during front cover or accessory work, or the rear main when the transaxle is out. A few pro tips help new seals last:

1. Use OEM-quality seals (material and lip profile matter on turbo engines and CVTs).
2. Lightly oil the seal lip, and check the shaft surface for grooves, use a sleeve if needed.
3. Set seals square and to the specified depth, torque covers and housings to spec.
4. Make sure crankcase ventilation (PCV/breather) isn’t blocked, as excess pressure forces leaks.

Left alone, a small weep can turn into a proper leak, affecting the drive belt, clutch friction surfaces (in manual markets), or CVT operation if it’s a transaxle seal. Catching it early keeps the Eclipse Cross tidy, reliable, and resale-friendly.

FAQs

Where do Eclipse Cross oil seals most commonly leak?
The front crankshaft area (behind the crank pulley), the rear main seal at the engine–transaxle join, and the CV/driveshaft output seals on the transaxle are the usual suspects. AWD models may also show light misting at the transfer case or rear diff pinion.

Can you keep driving with a minor oil seal weep?
If it’s just a light film and levels are stable, short-term driving is usually fine while you plan repairs. Keep an eye on oil level and the driveway. If drips develop, oil hits the exhaust, or CVT fluid is involved, book it sooner rather than later.

How much does a rear main seal job typically cost?
The seal itself is inexpensive, the labour is the kicker because the transaxle has to come out. Expect a larger job cost relative to other seals. Many owners schedule it alongside clutch/transaxle work (where applicable) to consolidate labour.