Oil light flickering on and off at stop or slow speeds- today stayed on constantly- oil is full- Anti freeze constantly low- needs to be refilled every few days for heat to work.

Best guess with the information provided is restricted flow of the catalytic convertors.At higher speed the rpm's stay consistant. If the cats are not allowing the exhuast to push thru unrestricted the engine will know its labored but not why.

One of two things may be happening. If the oil light stays off until the engine warms up and then begins to flicker on/off when you are idling & in gear [say at a stop sign] then you could actually have low oil pressure due to worn internal engine parts, OR, you could have a faulty sending unit that is reading the pressure incorrectly [usually low] and turning on the light. The best way to find out for sure is to have someone remove the sender and thread in an oil pressure test gauge to check and see exactly how much oil pressure you really have when the engine is first started and fully warmed up. You could just simply replace the sender and if the flickering is gone after that then you should be ok but if the flickering continues then odds are you actually do have low oil pressure. I would strongly recommend having the oil pressure tested for peace of mind then you'll know for certain what is happening. Engine bearings don't survive very long without sufficient oil pressure so you should have it checked out asap.

How's the anti-freeze doing? Usually when you see white smoke coming out the tailpipe it's because you are getting anti-freeze in the exhaust somehow. Try to sniff it a little does smell like anti-freeze, or oil? I don't know why the oil pressure would be low unless you are getting anti-freeze in the oil. Does the oil look milky, knda like chocolate milk? The low oil pressure could also be a faulty gauge, you may want to have a mechanic put a mechanical gauge on the car for test purposes.

could be a bad sending unit,or if the engine is knocking you have major problems

Sounds like your oil level is too low.
When you slow down or stop, your oil levels out and is too low for the gauge to read.
When you speed up, your oil sloshes and splashes the sensor, thus making it appear that it is circulating properly, when it actually isn't.

Is your temperature high, too?

There is a sensor on the driver side on the oil pan. Either the sensor is bad, or has bad connection or you are a quart low.

Check oil sending unit, i would use 10x 30 synthetic, walmart brand.

Most auto parts stores will scan the engine codes free or allow you to use theirs on site. Scan the code and post it back here for additional help.

hi there this sounds to me like your oil level indicator is saying the oil is low, if this is not the case you need an oil change.
or to stop hard turns and hard braking lol.

Regards JR

sounds like idle speed is to low,need to have rpm checked against manuf.suggested rpm