Parts for your 2020 Subaru Impreza-Oil seals

2020 Subaru Impreza oil seals: what they do and when to replace them

Referencing technical sources, oil seals are absolutely used on the 2020 Subaru Impreza. Subaru’s Global Service Manual (FB20 engine and Lineartronic TR580 CVT/transfer case) and Subaru genuine parts catalogues specify multiple oil seals across the powertrain, including the front and rear crankshaft seals, camshaft seals, CVT/input and differential side (drive shaft) seals, and front/rear final drive seals. That makes oil-seals relevant to this model.

On the 2020 Impreza, oil seals keep engine, CVT and differential lubricants where they belong while keeping dust and water out. They sit at rotating shafts and housings, maintaining pressure and preventing messy leaks that can degrade rubber mounts, foul belts, or, in the case of a manual, contaminate the clutch. In normal service these seals last a long time, but heat, age, crankcase pressure, or nicked sealing lips during prior work can cause weeping.

There isn’t a scheduled replacement interval for oil seals on this model, they’re inspected at routine services and replaced only if leaking. A workshop will typically check underbody and engine/CVT areas every 12 months or 15,000 kilometres, whichever comes first.

• Common seals on this vehicle: front and rear crankshaft, camshaft, CVT input/output and diff side seals, and front/rear final drive seals.
• Tell-tale signs: oil mist around the crank pulley, dampness at the bellhousing, spots on the driveway, burning-oil smell on warm-up, or oily residue near drive shafts.

When replacement is needed, best practice is to use OEM-quality seals, confirm crankcase ventilation is working (blocked PCV or breathers can force leaks), and set the seal to the correct depth with the lip lightly oiled. Front crankshaft and cam seals can be done from the front of the engine with the drive belt and pulley off. The rear main seal is more involved and usually done when the transmission is out, on CVT cars this is a larger job best bundled with other transmission-related work. Diff and axle seals are replaced once the shafts are removed, followed by correct fluid top-up and torque to spec.

Helpful care tips for owners: stick to the specified engine oil grade (0W‑20 for the FB20), don’t overfill, and have technicians check PCV function. Keeping the undertray clean and doing periodic visual checks around the front pulley and axle stubs makes it easier to spot early weeps before they turn into proper leaks.

Popular questions

Where are the most common oil seals on a 2020 Subaru Impreza?
They’re found at the front and rear of the crankshaft, around the camshafts, at the CVT input/output and differential side (drive shaft) locations, and in the front and rear final drives. These are all documented in Subaru’s service manuals and parts catalogues for the FB20 and Lineartronic driveline.

Do oil seals need regular replacement on this model?
No. Subaru doesn’t schedule them as a routine item. They’re inspected at each service and only replaced if there’s evidence of leakage or damage. Many last the life of the vehicle if the correct oils are used and crankcase ventilation is healthy.

What happens if an oil seal is ignored once it starts leaking?
Leaks can progress from a light mist to visible drips, leading to low oil levels, softening of rubber mounts and hoses, and contamination of the accessory drive belt. On manual models a rear main leak can oil the clutch, on CVT models, external leaks need prompt attention to avoid fluid loss and driveline issues.