It smells like gasoline in my water reservoir

Smoke in the morning is valve stem seals. They leak overnight into the combustion chamber.

burning oil

It shows that your car may be sludge or carbon distress. Sludge or carbon called the two killer contemporary engine, as long as it is harmful use gasoline engine not timely change the oil or will cause the engine coke using inferior oil. Recommendations for the engine cabin cleaning time, manufacturers use the specified oil; depth maintenance timing Use obd2 for automotive diagnostics , you can improve vehicle safety performance and driving more safer.

white smoke is a water leak on the cyl head , blue smoke is burning oil , black smoke is over fuel or a blokage in air intake or exhaust ! is it smelling ike steam or oil or fuel out of the exhaust ?

If the oil level goes up, something has to be leaking into the engine oil pan.
That would either be gasoline from the injectors or coolant from the radiator. If you are not adding coolant, it could be a leaking injector.

White smoke out the exhaust is a sign of either water in the fuel or coolant being burned with the fuel. Observe if you have any coolant consumption and if not, wait until your tank to empt and filled up with new fresh good quality gasoline and you will be allright. If you have a coolant consumption you will need a tool to pressure test the coolant system and find where is leaking. You can purchase it at Harborfreight tools. Could be head gasket, Throtllebody gasket, intake gasket and others... Good luck.

I was going to say that white smoke wouldn't be oil but I see that you figured that out. Look for loose coolant hose clamps on or near the reservoir or possibly a small crack in the reservoir itself. As a general rule for gasoline engines: White smoke = coolant, Blue smoke = oil, Gray smoke = fuel, Black smoke = "Uh oh, that can't be good." :-)

four cylinder?

It is not uncommon for these engines to start to "burn" oil. Check the oil level and confirm that it is low. If it is make sure to top it off and monitor the level.

Next time you change oil try using a oil designed for high mileage vehicles. We have been using Mobil High Mileage at the shop with pretty good results on higher mileage engines with oil consumption issues. We have have several of the same vehicles as your use the product and it has helped them as well. It can't hurt to give it a shot.

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White Smoke -- Coolant - bad head gasket

I can tell about a couple of odors from oils that are quite indicative of the places where they oil is leaking into the exhaust though.

You've got a few internal places where oil can get into the engine and even some can get into the combustion chambers. They have distinctive odors and can really help diagnose the cause or reason for the oil consumption.

First let's start with the "sweet-smells".

This means that the oil have gone through the combustion process along with the engine's fuel (gasoline or diesels too!). It is about the same smell you get whiffing the exhaust on a 2-cycle engine with gas-oil premix.

Places where this CAN happen:

1) Cylinder walls ie; piston rings, worn or broken.
2) PCV system where the oil is sucked into the manifold under vacuum and is entrained into the combustion chamber in the normal air-flow to the engine for combustion.
3) Intake runner-to-head surface gasket(s) where the intake can actually **** oil from the cam tray area or the inner valley between the heads and the intake manifold.
4) Occasionally from changing spark plugs in "well" type plug chambers that let the plug get very close to the head through the head casting. Taking a plug out and letting the collected oil fall into the cylinder is usually a temporary situation, but can scare you when it happens.
5) Cracked head or blown head gasket: this usually has to happen where the head has a high pressure passageway for the oil to travel through the head to get to a cam tower on top of the head.
6) Now - here's something that's gonna get debated, fer sure! ONLY the intake valves can leak past their stem seals and allow oil to travel down the stem onto the combustion process. Remember that I am speaking or "sweet" oil smell here.


Now some of the "not sweet" or bitter oil smell:

1) Exhaust guides or stem seals on the EXHAUST valves ONLY can cause a very acrid smell of nasty, eye watering and cough-inducing stink.
2) CVCC or pre-combustion chambers can also cause this problem. The Honda CVCC engines were notorious for this! The auxiliary valve can leak oil into the pre-chamber and then it opens the valve and dumps the burning mess into the main cylinder head area and the results are a bad BAD stink and lots of white/blue smoke.
3) RARELY...very rarely the exhaust port AFTER the exhaust valve seat can become perforated and allow oil to get into the exhaust stream. It does NOT burn here - rather it just cooks-off with a very bad smell.

So-o-o-o

Acrid oil smell - the oil has NOT gone through the combustion process in the cylinder head but is rather "cooked" into a stinky odor. It may or may not smoke too much too.

Sweet oil-burning smell - oil that has been burned as part of the combustion process in the combustion chamber on one or more or even all cylinders.