Parts for your 2013 Toyota Bb-Oil seals

2013 Toyota bB oil-seals — what they do and when to replace them

Oil-seals are absolutely used on the 2013 Toyota bB. Toyota’s service literature for the QNC20/QNC21 bB platform and the Toyota Electronic Parts Catalogue list multiple engine and transaxle oil-seals, including the front crankshaft seal, rear main seal, camshaft seal(s), and transaxle/differential side shaft seals. Aisin documentation for the paired automatic transaxle also specifies input and output shaft oil-seals. So the part is relevant and fitted from factory.

On the 2013 bB (typically with the 1.5‑litre 1NZ‑FE or 1.3‑litre 2SZ‑FE), oil-seals keep engine oil and transmission fluid where they belong while rotating shafts do their thing. Up front, the crank seal sits behind the harmonic balancer