Oil smell smells like it is burning oil last oil change was 3 months ago

Could be the engine, until the overhaul, was run on a low grade or low specification oil that allowed or even encouraged sludge and carbon to build up in the engine.
If a high detergent oil was used at the overhaul it would have scoured the inside of the engine, removing deposits so increased oil consumption is often the result.

The additive packs of some oils also tend to cause the premature hardening and failure of some types of rubber seal, though this was a huge problem 20-30 years ago it isn't seen much today.

could also be anti freeze leaking on a hot motor or ck if coolant is leaking on the pass. floorboard (from the heater core. Possibly through the vents.

Have you checked the oil,checked to see if dipstick and fuel cap are tight.Do you have oil spots on driveway? Those are the first things I would check,if oil is on driveway is it coming from the oil pan.It 'seems" it May be tied in with the oil change from 2 weeks ago

Their must be some oil stored somewhere and it is dripping on your exhaust manifold,but never pressure wash your engine, could cause worse problems,in time the smell will go away,just be patient.It will burn off in time.

Engine may have slipped off mounts and fan may be rubbing a hose. This would stop when you stop, be reason for water loss and burning smell . Check hoses around front of engine, if this is the problem then engine mounts need replacing and hoses.

depending on the type of car, you might have oil leaking directly onto the exhaust system, which is dangerous as it could possibly ignite. I would take it back to the oil change place and have them double check the oil filter to make sure the seal isn't leaking. AutoZone or Advance Auto can hook a mini scan tool to the car and tell you why the light is on.

This sounds like an oil leak. Look for leaks at valve covers, and other areas above the exhaust. It often is the burning off of this small volume of oil, that makes the smell like you describe. Inspect the whole exhaust...Something is melting, somewhere.

Oil is leaking on to an exhaust part.

The oil smells like gas? Change the oil. Do you have any running problems?

It is not unusual for an older truck to be burning a little oil. It is burning very little so you will not smell burnt oil or see blue smoke in the exhaust. But the oil burn does add up and you may notice a drop on the oil dipstick after a few weeks. On a 9 year old truck under normal working conditions will burn a little oil. If you are having to add 1 liter between oil changes, that is ok, just shows normal engine ware. 2 Liters is acceptable between oil changes if the truck does a lot of heavy pulling or work. 3 or more liters indecates a problem, but at that rate, you should be able to smell oil and see blue smoke.