Here is one site that has some great info, not only for sinuses, but for many other things as well. I use oregano in lots of things but never have used the oil. I learn something new everyday! Isn't that great!!!

http://www.woodlandnaturalremedies.com/canwebsite/oregano_oil_canada.html

For external application, dilute as follows: mix 3 drops of Wild Oregano Oil in 1 ounce of cream, liquid soap, shampoo, or carrier oil like olive oil or almond oil (do not use mineral oil).

Acne / Pimples:
Add Oil of Oregano to liquid face soap or cleanser and wash face twice daily. Avoid contact with eyes.

Arthritis / Rheumatism:
Add Oil of Oregano to carrier oil and rub on affected joints morning and evening until condition improves.

Athlete's Foot:
Add Oil of Oregano to carrier oil and apply to affected areas of feet, being sure to reach areas between the toes. Repeat 2-3 times daily until signs of infection have cleared.

Boils:
Add Oil of Oregano to carrier oil and apply to the boil 3 times per day. Also drink 1 drop of Oil of Oregano in a small glass of water or in 1 teaspoon of olive oil, 2-3 times per day.

Bursitis:
Add Oil of Oregano to carrier oil and apply to the affected joints 3 times per day. Also drink 1 drop of Oil of Oregano in a small glass of water or in 1 teaspoon of olive oil, 2 times per day.

Candida (Candidiasis):
Drink 1 drop of Oil of Oregano in a small glass of water or in 1 teaspoon of olive oil, 2-3 times per day .

Cankers:
Add Oil of Oregano to carrier oil and dab onto the sores several times per day.

Colds:
As a preventative, drink 1 drop of Oil of Oregano in a small glass of water or in 1 teaspoon of olive oil, once per day. If a cold is starting, take 2 drops of Oil of Oregano 3 times per day until symptoms are alleviated.

Cold Sores:
Add Oil of Oregano to carrier oil and apply to cold sore at first sign of its occurrence. Also drink 1 drop of Oil of Oregano in a small glass of water or in 1 teaspoon of olive oil, 2-3 times per day. Some people prefer to apply undiluted oil of oregano directly to cold sore.

Cough:
Drink 1 drop of Oil of Oregano in a small glass of water or in 1 teaspoon of olive oil, 2-3 times per day.

Dandruff / Seborrhea:
Add Oil of Oregano to shampoo (5 drops per ounce) and wash hair and scalp thoroughly. Allow shampoo to soak in for a few minutes before rinsing. Be careful to avoid contact with eyes.

Diarrhea:
Drink 1 drop of Oil of Oregano in a small glass of water or in 1 teaspoon of olive oil, 3 times per day. For severe cases, double the dose. Be sure to drink plenty of water to avoid dehydration.

Digestive Problems:
Drink 1 drop of Oil of Oregano in a small glass of water or in 1 teaspoon of olive oil before each meal.

E. Coli:
For prevention, drink 1 drop of Oil of Oregano in a small glass of water or in 1 teaspoon of olive oil, twice daily. During local outbreaks, double the dosage. To help fight infection, drink 3 drops of Oil of Oregano in a small glass of water or in 1 teaspoon of olive oil, 5 times per day.

Eczema:
Add Oil of Oregano to carrier oil and apply to affected areas twice per day. Drink 1 drop of Oil of Oregano in a small glass of water or in 1 teaspoon of olive oil, twice per day.

Fingernail and Toenail Infections:
Drink 1 drop of Oil of Oregano in a small glass of water or in 1 teaspoon of olive oil, before each meal. Add Oil of Oregano to carrier oil and apply to the nail and nail bed, as well as rubbing some on surrounding area.

Head Lice:
Thoroughly wash hair and scalp with a tablespoon of non-chemical shampoo to which 10 drops of Oil of Oregano have been added. This will kill the adult lice. To remove nits (very important), separate hair in sections and remove all lice and attached nits using a nit comb and fingernails as required. Wash all bedding, recently worn clothing and cloth hair accessories in hot water to which 60 drops of Oil of Oregano Oil have been added. Soak combs, hair brushes, barrettes etc. in hot (not boiling) water to which 10 drops of Oil of Oregano have been added. Continue treatment until all lice and nits are removed.

Influenza:
For prevention during flu season, drink 1 drop of Oil of Oregano in a small glass of water or in 1 teaspoon of olive oil, twice per day. To fight a flu infection, drink 2 drops of Oil of Oregano in a small glass of water 3 times per day.

Parasites (internal):
Drink 1 drop of Oil of Oregano in a small glass of water or in 1 teaspoon of olive oil, 3 times per day.

Poison Ivy, Poison Oak:
Add Oil of Oregano to carrier oil and apply to affected areas 3 times per day.

Psoriasis:
Add Oil of Oregano to carrier oil or cream and apply to all affected areas twice per day. Drink 1 drop of Oil of Oregano in a small glass of water or in 1 teaspoon of olive oil, twice per day.

Ringworm:
Add Oil of Oregano to carrier oil or cream and apply to all affected areas twice per day. Drink 1 drop of Oil of Oregano in a small glass of water or in 1 teaspoon of olive oil, twice per day.

Salmonella:
Drink 1 drop of Oil of Oregano in a small glass of water or in 1 teaspoon of olive oil, 3 times per day. For severe cases double the dose.

Sore Throat:
Add 1 drop of Oil of Oregano to salt water and gargle twice per day. Drink 1 drop of Oil of Oregano in a small glass of water or in 1 teaspoon of olive oil, 3 times per day.

Viral Infections:
For prevention, drink 1 drop of Oil of Oregano in a small glass of water or in 1 teaspoon of olive oil, twice per day. To fight infections, drink 2 drops of Oil of Oregano in a small glass of water or in 1 teaspoon of olive oil, 3 times per day.

Warts:
Add Oil of Oregano to carrier oil and apply to affected areas 3 times per day. Drink 1 drop of Oil of Oregano in a small glass of water or in 1 teaspoon of olive oil, twice per day.


Storage:

Store in a cool dark place out of the reach of children.

Directions for Pets:

Wild Oregano Oil can be used for pets in many of the ways it is used for people. Wild Oregano Oil can be added to virtually any topical preparation like shampoo, creams, etc. Mix 3 drops of Oregano Oil per 1 ounce or carrier oil, cream or shampoo (do not use mineral oil).