Parts for your 2015 Subaru Impreza-Oil seals

2015 Subaru Impreza oil seals: what they do and when to replace them

Oil seals are absolutely fitted to the 2015 Subaru Impreza. Subaru’s factory service information for the 2015 Impreza (FB-series engine) and the Subaru Genuine Parts catalogue list multiple seals across the engine and driveline, including the front and rear crankshaft oil seals, camshaft seals, oil pump seal, and transmission/differential axle shaft seals. These references make it clear oil seals are relevant wear items on this model.

On a 2015 Impreza, oil seals keep engine and transmission fluids where they belong and stop dust and moisture getting in. Think of the front and rear crank seals at either end of the crankshaft, camshaft seals up top, and the side seals where the front drive shafts slide into the transmission or front diff. When they harden or wear, owners may notice oil spots on the driveway, a whiff of burnt oil, or residue around the timing cover, bellhousing, or axle stubs.

There isn’t a fixed kilometre-based replacement interval for oil seals. The smart play is to inspect them at every routine service (10,000–15,000 km or annually, as per local schedules). Replace any seal that’s weeping or leaking, and consider preventative replacement when related work is already underway, such as:

• Front-of-engine work (drive belt, crank pulley, timing cover access)
• Clutch or transmission removal (ideal time for the rear main seal on manual models)
• CVT/gearbox service where an axle is removed (good moment to refresh a damp side seal)

Good practice matters. Use genuine or high-quality seals, lightly oil the seal lip, and install squarely with the correct driver so it sits flush—no cocking or over-driving. Follow factory torque specs for components like the crank pulley. Keeping crankcase ventilation (PCV) healthy helps reduce pressure that can push oil past seals, and using the correct grade oil and not overfilling also protects them.

Owners should keep an eye out for tell-tales: oily mist on the front of the engine, wetness at the gearbox bellhousing, or fresh fluid around axle entries. Minor seeps can sometimes be monitored after a clean and recheck, but leaks near belts or the exhaust should be sorted promptly to avoid knock-on damage. With regular checks and timely replacements, the Impreza’s oil seals quietly do their job, keeping the FB engine and Subaru’s driveline tidy and reliable for the long haul.

• Does the 2015 Subaru Impreza have a rear main seal?
  Yes. It’s the rear crankshaft oil seal between the engine and transmission. If it leaks, expect oil at the bellhousing. Replacement requires removing the gearbox, so many owners time it with a clutch job (manual) or major transmission work.
• How often should oil seals be replaced?
  There’s no set interval. Inspect at each service and replace if leaking or when convenient during related repairs. Quality seals can last many years and well over 150,000 km if the PCV system and fluids are in good nick.
• Can a small oil seep be monitored?
  Often, yes. Clean the area and recheck after a few hundred kilometres. If the seep worsens, reaches belts or the exhaust, or causes a drop in oil level, plan a seal replacement sooner rather than later.