Oil from a reed diffuser spilled all down my bathroom wall on Benjamin Moore paint how can I remove the oil thT stained the painted wall

clean ceiling and use BIN primer (2 coats). Ceiling peeled from build of moisture, install a vent fan and have it wired to bathroom light. This way if light is on fan is on.

you need to leave if for a few weeks to dry out. or put a heater in room to help dry the dsmp patch, air flow heater. one with a fan.

There are 2 types of paint I do not like, Behr and Dulux. Buy Benjamin Moore for best results. Painting wallpaper is not advised, if it is not adhered on well, you can have trouble. Streaks could be condensation, especially in a bathroom, a kitchen can also be damp because of boiling pots. Warm moist air condenses on a cool object. It could be the wall paper is losing adhesion. Check to see if the paper moves a bit when pressed. Remedy is remove the wall paper and repaint. Get all the glue off, scrape it after soaking the wall. Sand the wall, wash with TSP, rinse with clean water. If you don't do this, you will get a lousy paint job. You would be best to prime then top coat. Alternately get a paint that is self priming. In a moist area use Zinnser
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Zinsser 1 gal Perma White Mold and Mildew Proof Satin Interior Paint 2...

Could be the paint you're using was old, sat around too long and was not properly stirred, before applying? or did you apply multiple coats without waiting enough or too long in between? You will have to strip all the paint off using a chemical paint stripper. Then wash off all the stripped with the proper solvent, then wash off the solvent. Make sure the wood is totally clean. Then sand lightly to open the pours of the wood. Apply one coat of primer, let dry, then apply as many coats of paint as you want, just make sure its dry between each coat, etc..

Most likely you have some foreign material on the surface, Furniture wax, lemon oil are a few. You will need to wash them down with wax/polish remover, then with paint thinner. You could also try TSP.

you might be able to buff it.

try sealing it with a good gloss oil based undercoat

Hi there. Try to remove as much of the old paint as possible. You should sand down the wood and paint a little bit to rough up the wood and only then paint over it. Paint sticks much better to roughed up wood. Oil based paint would also be a better solution. The best solution is to use stain, if that's an option. Alex

Spitting is usually caused by not filtering the paint through a strainer (made for the purpose by the paint manufacturer). The paint debris blocks the paint for just a moment, then spits it out. Easy fix!