Toyota Matrix 2012 Oil Filter Cap becomes extremely tight and hard to open I was working on my Friend’s Toyota Matrix 2012 Oil Change and I encountered a situation with its Special Oil Filter Cap. The cap was excessively tight and it was so difficult to open it. I manage to open the cap, but my finger got injured.

I used a wrench and the tool shown in below pictures. It is quite efficent. enter image description here

I do member I did not over tightened the cap during the last oil change per instruction on the oil filter. Is there any special technique that I was missing? Why the cap became so tight?

  • Hard to open by hand, or hard to open even with your tool and a wrench?
    – JPhi1618
    Mar 28 '16 at 14:34
  • Just edited the question. I used a wrench.
    – Allan Xu
    Mar 28 '16 at 14:37
  • They sometimes become tight due to heat cycles (engine cold-hot-cold). This is not abnormal.
    – race fever
    Mar 28 '16 at 15:13

I run into this a lot its a combination of the o-ring and the filter cap bing plastic/rounding off. If you have someone lightly pry against the cap and tap it with a hammer and chisel it usually breaks free.

You should always replace the o ring and apply some clean oil to it when changing the filter

  • Would adding an extension to the wrench's arm help or it might cause a damage?
    – Allan Xu
    Mar 28 '16 at 16:05
  • @AllanXu It helps, but you have to be extra careful. A short piece of tubing will do the trick. Don't hit the wrench arm with anything. You will break the plastic parts.
    – race fever
    Mar 28 '16 at 20:31
  • you can try it may end up slipping though
    – Ben
    Mar 28 '16 at 20:32
  • @racefever, I am not following what is "short piece of tubing"?
    – Allan Xu
    Mar 28 '16 at 22:45
  • @AllanXu He means a piece of steel pipe that slips over the ratchet to gain extra leverage.
    – Ben
    Mar 28 '16 at 22:47

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