What kind of oil does a 2004 ford taurus use?

airflow sensor U/s or oxygen sensor issue

What kind of wet? Is the wetness gas, oil, or water? There are different types of fouling possible with reading the color of the old plug being a good indicator. Is the compression within limits?

Check your intake manifold by taking it off and comparing the ports going into the head. If the intake port on #4 cylinder is wet there may be a problem in the Intake. You will also be able to look at the intake valve stems on most motors. The newer designs have the water going into the block directly so the Intake contains no water.

You could have a bad oil seal on the valve stem. You could have a head gasket leak. Even some oil rings can still sling oil and if the power rings are good, it still will compress and give good readings.

You need to run the motor again and try wiping the plug again to see what kind of deposit is on it.

what kind of noise are we talking about

It's either the coolant or windshield washer fluid level warning. check both .

Press setup button until you see remaining oil life message (it will say like 9% or something) so the message will kind of look like this

Oil life remaining
9%
Hold reset for new

When you see this, hold the reset button. This will reset the oil life to 100%

yep

In the summer it's best to use a heavier weight than you do in the winter. I usually use 10w/30 or 10w/40 in the summer, but in winter i use 5w/20 or 10w/20. As far as brand, it's really a personal preference. I still use castrol in my personal vehicle.

Hello, according to Snap-On / Shopkey / General Drivers,
For your 2004 Ford Taurus:
1. Inspect Accessory Drive Belt 2. Perform Multi-Point Inspection (Recommended) 3. Replace Engine Coolant 4. Replace Engine Oil 5. Replace Engine Oil Filter 6. Replace PCV Valve 7. Replace Spark Plugs 8. Rotate Tires.
This is going by the general consensus from Snap-On tools and Ford Motor Co. Hope this helps :)

Did you recently have a transmission fixed?
If so it sound like the drive plate bolts were not applied with Loctite.
Maybe a oil viscosity problem if not a transmission job.