Parts for your 2019 Subaru Impreza-Oil seals

2019 Subaru Impreza oil seals — what they do and when to sort them

Oil seals absolutely are used on the 2019 Subaru Impreza. Subaru’s own technical references — the 2019MY Impreza Service Manual (FB20 engine and Drivetrain sections), the TR580 Lineartronic CVT manual, and the Subaru parts catalogue — list multiple seals, including the front and rear crankshaft oil seals, camshaft seals, front differential side (axle) seals built into the CVT, and rear differential pinion and side oil seals.

These seals keep engine, transmission and differential lubricants where they belong, while keeping dust, water and grit out. Under the bonnet, the front crankshaft seal sits behind the crank pulley and contains engine oil at the timing cover, at the back, the rear main seal keeps oil from escaping into the bellhousing. Up top, camshaft seals stop oil tracking out of the cam carriers. In the driveline, the CVT’s integrated front diff uses oil seals where the front driveshafts enter, and the rear diff has seals for the pinion and the axle stubs. When these are healthy, the Impreza runs clean, quiet and leak‑free.

There’s no fixed kilometre replacement interval for oil seals, Subaru’s guidance is to inspect during routine servicing (every 12,500–15,000 km is common in AU/NZ) and replace any that show weeping, wetness or active leakage. Good practice when a seal leaks is to confirm crankcase ventilation (PCV) is working, as excess pressure can push oil past a new seal. Use genuine or OE‑quality seals, clean the bores, lightly oil the lips, and press to the specified depth — don’t just hammer them flush. After axle or diff seal work, refill with the correct Subaru CVTF or gear oil and check levels hot, following the manual. For the engine front seal, a proper crank pulley holding tool and correct torque are a must, rear main seal replacement is gearbox‑out and best planned alongside clutch work (manual) or major transmission service (CVT) to save labour.

• Common clues it’s time: oil mist at the crank pulley, drips from the bellhousing, CVT/diff seepage at axle inlets, burning‑oil smell on warm‑up.
• Nice-to-do while you’re there: renew accessory belts, inspect timing cover sealant, replace axle circlips and O‑rings, and clean breather paths.
• If leaks persist, check for overfilled fluids, blocked PCV, or hardened mating surfaces before blaming the new seal.

Does the 2019 Subaru Impreza have engine and driveline oil seals?

Yes. The FB20 engine uses front and rear crankshaft oil seals and camshaft seals, while the AWD driveline has oil seals in the CVT’s integrated front differential and in the rear differential. These are documented in Subaru’s 2019MY Impreza Service Manual and parts catalogue.

How often should oil seals be replaced on a 2019 Impreza?

They’re not a scheduled replacement item. Inspect at each service (about every 12,500–15,000 km in AU/NZ). Replace if you see wetness or leaks, or when related components are off — for example, front crank seal during front‑end engine work, or axle seals during CV shaft replacement.

What are the signs of a leaking oil seal on this model?

Look for oil mist around the crank pulley, drips from the bellhousing, oily residue where the front axles enter the CVT, or wetness at the rear diff. You might notice spots on the driveway or a whiff of burning oil after a drive. Addressing it early helps protect belts, rubber bushes and CVT/diff internals.