Parts for your 1998 Subaru Forester-Oil pump

1998 Subaru Forester Oil Pump — What It Does and When to Service It

Yes, the 1998 Subaru Forester absolutely uses an oil pump. This is confirmed by the Subaru Factory Service Manual for the 1998 Forester (lubrication system section), the Subaru genuine parts catalogue listing oil pump assemblies for EJ20/EJ25 engines, and widely used aftermarket manuals such as the Haynes Subaru Legacy & Forester guide. It’s a crankshaft-driven gerotor pump mounted on the front of the engine block, sitting behind the timing belt crank sprocket.

This oil pump is the heart of the EJ engine’s lubrication system, pushing pressurised oil through galleries to bearings, camshafts and lifters, keeping everything cool and slippery. On an ageing SF-series Forester, healthy oil pressure is what stops the big-end and cam journals from copping a flogging, so the pump’s condition matters just as much as the oil you pour in under the bonnet.

As part of routine servicing, it’s smart to think about the oil pump whenever the timing belt is off (roughly every 100,000–105,000 km, or sooner in harsh Aussie/Kiwi conditions). That’s the perfect time to:

• Inspect for leaks around the pump body, front crank seal and pump O-ring.
• Reseal the pump with the correct anaerobic sealant specified by Subaru and fit a fresh O-ring and front main seal.
• Check the oil pump backing plate screws