Guys need help, just looked at the oil filler cap on my car

& its got a lot of mayo on the bottom, i know this is a recent situation as I check the oil

& top up regularly.

What i need to know is where possibly could the water in the oil be coming from

(obviously the head gasket is the prime suspect here), but I have recently removed the oil filter

& housing the threaded stem that the filter screws onto, could this be the cause of my problem?

Oh removing the filter stem was ok but putting it back was really tight could I have done any dammage?

HELP.

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