Too much oil is being delivered on the chain, how do I adjust the oiler on my Stihl 038av super?

To replace the chain oiler line on a Stihl 036 chainsaw, you will need to follow these steps:

1. Disconnect the spark plug wire to prevent the chainsaw from starting accidentally.
2. Drain the old chain oil from the oil tank.
3. Remove the old chain oiler line from the chainsaw.
4. Clean any debris or blockages from the oiler hole.
5. Cut a length of new chain oiler line to the appropriate size. The line should be long enough to reach from the oil tank to the oiler hole on the bar.
6. Attach one end of the new chain oiler line to the oil tank and the other end to the oiler hole on the bar.
7. Secure the line in place with the appropriate fittings and clamp.
8. Fill the oil tank with the recommended type and amount of chain oil.
9. Reconnect the spark plug wire and test the chain oiler to ensure it is functioning properly.

It is important to use the correct type and amount of chain oil to ensure the chainsaw operates properly and to extend the life of the chain and bar. If you are not comfortable performing this repair yourself, it is recommended to have a professional chainsaw repair technician handle the repairs for you.
Regenerate response

MS291 Does NOT have an oil adjustment screw. It is an auto oiler. Make sure the ports are clean and oil is coming out running the saw with chain off. Then add a little canola oil to your chainsaw bar oil and thin it down. You will get a better flow. Stihl has a poor design on this model.

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Part of the routine service while sharpening the chain and adjusting the chain tension is to remove the guide bar to clean the slot and to clean the side of the saw case of any and all impacted crud. This impacted crud many times inhibits the oil flow to the bar causing it to appear as though the oiler is not oiling. Make sure you clean the discharge port of the oil pump...it will be the opening that aligns with a slot in the bar to transfer the oil to the chain.

After cleaning and reassembling, start the saw and rev it up for 2 to 3 seconds and observe the bar tip as it is aimed against a clean piece of cardboard. If the oiler is working, within this time frame, a thin film of oil will appear as it is slung off the bar tip.

from stihl documentation it does not seem that you can replace it. I have appended the manual for you and an article dealing with chain oil delivery system for 0009
Stihl Chain Oiler Trouble
How to Unstop the Oiler on Stihl Chainsaw
http://www.stihlusa.com/stihl_ownersmanuals/009_manual.pdf

remove your bar and chain. check now for oil. also at this point clean and inspect the oil hole on your bar. if you get oil from unit with bar and chain off then the problem is in your bar. if still no oil and assuming you have oil in reservoir then remove clutch and oiler cover remove the worm gear and inspect. if damaged replace if not with low pressure used compressed air through to resevior

Turn the saw upside down so you're looking at the bottom. There will be a little hole with a flat head adjusting screw on the clutch side of the crank housing with an arrow and a + and - sign with an oil drip logo.

There is no oil "regulator" only an oiler with a screw that adjusts the flow, that is found below the saw, and is fit for a slotted screwdriver.

First thing I would try is wash out the oil tank with a little bit of diesel fuel then run some thinner oil thru it to see if it gets better . I usually leave bar and chain off when I do this.. or if it is oiling but not going down the bar check the bar oil holes.

The Stihl 026 PRO does have an adjustable oiler and it is located on the bottom of the saw just below the clutch drum.
Stihl also builds an 026 "Standard" without the adjustable oiler, however, the hole location for adjustment is still there.

The 026 PRO will also have a decompression valve on top of the saw to make the rope easier to pull during startup. If you have the DECO valve you should also have the adjustable oiler. Hope this helps.