A customer from Mexico was searching for a reliable supplier of COMBI SF Oil Seals with the following specifications: Product: COMBI SF Oil Seal Size: 35 × 52 × 17/18.5 mm Material: NBR + AU Reference Number: Corteco 12019673B Required Quantity: 500 pcs However, before placing the bulk order, the customer had one major concern: product quality. He had previously purchased oil seals from another supplier, but the performance was far below expectations. Poor sealing performance