How much motor oil do I put into a 1991 Jeep Wrangler? It is a 6 cylinder. Somewhere about 4000 cc.

where is it, on a 2.5L I4 jeep. 1991. ok. first ever post with engine size.
bravo that. amazing....
the FSM covers this. factory service manual;,.
ok, i see you are reading books or web sites that have generic tuneup information, not relate to real jeeps, yes?
or bob with a toyota told me to change it out? yes?

Guess what?, there IS NONE.
it only has and ORIFICE.
and sure it can clog, and does, in fact i drove for 500,000 miles
in 3 jeeps. and cleaned it vast times.
on one car , the grommet got old and it the orifice collapsed.
and i had to buy a new one from jeep.
see word FIXED below.?
when it clogges, the engine leaks oil
and the oil pukes (backups) and dumps oil on the air cleaner.
there is no PCV valve, on this engine. but that dont mean its service free.

Wrangler 6 cylinders engines are a straight 6 engine with only one valve cover. The gasket for the valve cover is sold separately from the entire valve cover so it can be replaced.

This is the correct diagram for non-AC vehicles.

Sounds like a compression ring in one of your cylinders has broken and compression is being pushed into oil pan. Cylinder compression getting past the piston, instead of going out the exhaust it's going into oil pan and coming through engine (dipstick, air cleaner, PCV.) You'll need to have a compression test to confirm.

Hi Alex,

They are a pain the first time. There is a deceptively easy trick to it. I wrote out the step by step for taking it off / putting it on.

Click here for the trick

Hope you find it helpful

Mike

Under hood, driver side, lower engine area, front of distributor, mounted in engine block.

It looks looks this;

Yes there is a PCV valve, you just have to look for it.
Engine may be over full on oil.

your oils sending unit is leaking the part is not expensive,

U have what is called a hydraulic clutch, one of the hydraulic cylinders hs failed, there is a master and a slave cylinder. The most likely and most common cylinder to fail is the slave cylinder, this requires the transmission to be pulled out to replace it. the art is around $125.00, while the trans is out u might as well replace the clutch, the labor is about the same. Here is a picture of the part, let me know if u can see it.

get a 6 cylinder motor drop in this is best gas saver for most vehicles 4 cylinders dont have the ability to push all the weight of a vehicle but runs smoothly
6 cylinders are as i put in words are evenly balanced for everyday use and not gas guzzler either