When you tighten oil cap, as it first touches down, does it feel soft, as rubber gasket compresses? Can you press fingernail into gasket and make an impression?

You don't mention replacing the dipstick o ring. That can leak too. Honda only sells the whole dipstick. But you can get a suitable hardware store o ring by size. There is a thread somewhere with size to use.

 

Gasket looks squished.

Should look like this. Note the concentric rings on the gasket.

 

I was finding to get a new dipstick o-ring. Thanks for your advice.

 

I see. I think I should replace that one too. Thanks for help, will keep you posted.

 

btw, what I should use to clean up those oil stains?

 

Regular kitchen spray cleaner or dish washing (not dishwasher) soap didn't remove it?

-- Chuck

 

Soap is okay, but it still visible.