My dad bought a 2001 Camry LE, 2.2 liter 4 banger. He asked me to change oil for him since he wasn't sure when it was last done, (car has 18k miles) and he just bought it 3 weeks ago. So anyway, the old filter was a plain Mobil filter (not Mobil 1), and the new filter i bought was the Purolator blue ones (the more expensive ones). I noticed that the Purolator was smaller in size than the Mobil that was already on there, is this normal? I looked it up in the book in the auto parts store and definitely bought the right model.............. not sure what the reason is