2004 Mazda MPV

Hi, I bought my van with 24k miles.I always changed oil myself, using Mobile1 5w30 syn. At approx80K started to misfire. Confirmed by my mechanic to be cyl #4. I read on your repair topics / engine misfire page.

d. Wrong weight motor oil was installed holding the cam followers from adjusting.

oops I'm supposed to use 5w20, my bad. I need your help! What do I do? I have disassembled rebuilt engines before so if you could please tell me what to do
October 3, 2007.

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