Parts for your 1998 Subaru Forester-Oil seals

1998 Subaru Forester oil seals — fitment, purpose, and service advice

Oil seals are definitely fitted to the 1998 Subaru Forester. Subaru’s Factory Service Manual for the SF-series Forester (1997–1999, EJ20/EJ25) documents multiple engine, transmission, and differential oil seals in the Engine (ME), Lubrication (LU), Manual/Automatic Transmission (MT/AT), and Differential sections. The Subaru Genuine Parts catalog for the same model years also lists specific seals such as front and rear crankshaft seals, camshaft seals, oil pump seal, axle/diff seals, and transmission output/input seals (typical Subaru part families include 8067xx and 80673x). These technical sources confirm the Forester relies on oil seals to keep fluids in and contaminants out.

The 1998 Forester’s oil seals do the quiet, vital work of keeping engine oil, gearbox oil, and diff oil where they belong. Around the EJ-series engine, key seals include the front and rear crankshaft seals, camshaft seals, and the oil pump seal. In the driveline, expect front diff/axle seals, transmission input/output shaft seals, and rear diff pinion and side seals. When these age or harden, owners may notice oily weeps at the timing cover, damp bellhousing edges, or spots on the driveway. Left too long, a front leak can soak the timing belt, while a rear main leak can contaminate the clutch—so staying on top of it pays.

Best practice for this era Forester is to inspect for leaks at every service and plan proactive replacement of the front crank and camshaft seals when doing the timing belt (typically around 100,000 km or 5 years in AU/NZ conditions). If oil has reached the belt, replace the belt and tensioners as well. The rear main seal isn’t a routine item, it’s tackled when there’s a proven leak or when the gearbox is already out for a clutch. While in there on early EJ engines, many technicians also address the oil separator plate with the updated metal version—an adjacent but sensible reliability upgrade.

A quality, double-lip seal from OEM or a reputable brand is worth it. Fitment tips seasoned Subaru techs follow include: inspect and polish sealing surfaces, use a proper seal driver, pre-lube the seal lip with clean oil, and avoid driving the seal too deep. Checking the PCV system helps prevent crankcase pressure from pushing fresh seals back out. For diff and trans seals, confirm breather function and correct fluid level after work is complete.

• Common tells it’s time: burning oil whiff after a drive, fresh oil on the timing cover, damp bellhousing, or drips from the crossmember.
• Do it once, do it right: combine front seals with the timing belt service, reserve rear main for verified leaks or clutch jobs.

Popular questions about 1998 Subaru Forester oil seals

Which oil seals most often need attention on a 1998 Forester?
On high-kilometre EJ engines, the front crankshaft seal, camshaft seals, and oil pump seal are the usual suspects, especially if the timing belt interval is overdue. In the driveline, front diff/axle seals and transmission output seals may seep with age or if a CV or driveshaft has been out and in a few times.

How often should oil seals be replaced?
There’s no strict time-based interval. They’re replaced on condition. That said, it’s smart and cost-effective to renew the front crank and cam seals during the timing belt service (about every 100,000 km/5 years). Rear main seals are generally left until there’s a confirmed leak or when replacing the clutch.

Is it safe to keep driving with a small oil seal leak?
A light weep can often be monitored with regular oil checks, but delaying too long can escalate repairs—oil on the timing belt can cause belt degradation, and oil at the rear main can contaminate the clutch. If oil consumption rises, there’s a burning smell, or drips worsen, it’s time to book the job.