Rotary shaft oil seals and complete assembly kits for Toyota/Geely – crankshaft seals, camshaft seals, transmission input/output seals, and differential pinion seals. Every assembly includes the correct seal with factory-spec inner diameter, outer diameter, width, lip geometry, and garter spring tension. Consistent interference fit and sealing pressure across batches. 
Why This Matters in 2026
Oil seals are one of the most underestimated failure points in engine and drivetrain repair. Based on our 2025 supply data covering 15,000+ oil seal shipments to Toyota and Geely distributors, 60% of oil leakage cases were caused by improper installation to the housing bore or shaft, 30% by unsuitable operating conditions, and only 10% by seal design faults. In this guide, we share our experience supplying crankshaft seals, camshaft seals, and transmission seals to distributors and repair shops across the Middle East, Southeast Asia, and Latin America, covering everything from material selection and failure diagnosis to installation best practices and OEM cross-reference.
FKM vs. NBR vs. PTFE: Choosing the Right Seal Material
The material of a lip seal determines its performance, longevity, and failure modes. Choose the wrong material, and even a perfectly designed seal will fail prematurely.
NBR (Nitrile Rubber) is the workhorse of the sealing industry. It offers excellent resistance to petroleum-based oils and fuels at moderate cost. Temperature range is -40°C to +100°C. Best for general-purpose automotive applications and cost-sensitive projects. Limitations include poor ozone and weather resistance.
FKM (Fluorocarbon / Viton) is the premium material for high-temperature and aggressive chemical environments. Temperature range is -20°C to +200°C. Excellent high-temperature stability, broad chemical resistance, and excellent ozone and weather resistance. Best for high-temperature engine seals and automotive fuel systems. Limitations include higher cost and poor low-temperature flexibility in standard grades.
PTFE (Polytetrafluoroethylene) is not an elastomer but a thermoplastic with unique low-friction properties. Temperature range is -200°C to +260°C. Extremely low coefficient of friction, universal chemical resistance, no stick-slip. Best for high-speed shafts and low-lubrication applications. Requires an energizer spring or O-ring. Limitations include lower extrusion resistance and higher cost.
PU (Polyurethane) is the material of choice for high-abrasion, heavy-duty applications. Temperature range is -40°C to +80°C. Excellent abrasion resistance and extrusion resistance. Best for heavy-duty hydraulic rod seals and wipers. Not suitable for strong acids or solvents.
Symptoms of a Failing Oil Seal
Before replacing any oil seal, confirm the fault is actually the seal, not excessive crankcase pressure, a worn shaft, or a blocked breather.
Oil mist or drips at the crank pulley area: front crankshaft seal failure. Recommended action: inspect the seal lip and check the shaft for grooves.
Oil at the bellhousing weep hole: rear main seal failure. Recommended action: confirm the leak source before removing the transmission.
Burnt oil smell after a drive: oil leaking onto the hot exhaust. Recommended action: locate the leak source immediately.
Oil slung onto the underside of the bonnet or splash shields: front seal leak at high RPM. Recommended action: check seal lip condition and crankshaft ventilation.
Clutch slip with oil at the bellhousing: rear main seal leaking onto the clutch. Recommended action: replace the rear main seal during clutch service.
Dampness at the differential pinion: pinion seal failure. Recommended action: check for blocked differential breather before replacing the seal.
Root Causes of Oil Seal Leakage: What Most Guides Don't Tell You
Based on SAE technical research and our field data, 90% of oil seal failures are caused by factors outside the seal itself. Replacing the seal without fixing the root cause will result in a repeat leak.
Blocked PCV or breather system: this raises crankcase pressure and pushes oil past a good seal. Always verify the ventilation system is functioning before replacing any seal.
Worn shaft surface: if the shaft has a groove where the seal lip contacts, a new seal will not last. Measure the shaft surface and consider a repair sleeve if the groove exceeds 0.1 mm depth.
Improper installation: a cocked seal or one installed without proper tools will leak from day one. Use a seal driver matched to the bore size. Never tap directly on the seal lip.
Incorrect seal material: using NBR in a high-temperature application or FKM in a low-temperature application will cause premature hardening or cracking.
Excessive shaft runout: if the shaft has more than 0.05 mm runout, the seal lip cannot maintain consistent contact.
OEM Part Number Cross-Reference: Toyota and Geely
Oil seals for Toyota and Geely frequently share OEM numbers because of platform sharing and common supplier bases.
90311-32017: fits Toyota and Geely applications. Used as a crankshaft or camshaft seal depending on the engine.
90311-89014: fits Toyota, Lexus, and Geely applications. Rear main seal or transmission seal depending on the model.
90311-70004: fits Toyota and Geely applications. Commonly used as a crankshaft front seal.
90311-38025: fits Toyota and Geely applications. Camshaft seal for select engines.
E010130010: Geely-specific part number that crosses to Toyota 9004A31021 and other references.
Always verify the OEM number rather than relying on model year alone. The same Toyota or Geely model can use different seal specifications depending on the production plant, engine code, and market. Send us your VIN or original part number and we will confirm the correct seal within 24 hours.