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Blue'ish smoke is caused by burning oil. Sounds like you have hardened valve stem seals. When they get hard, they allow oil to seep into the cylinders while it sits over night. When you start the car it takes a little while to burn out the oil. In the early stages once you are running it will seal up OK, but as time goes by it will begin to seep even while you are running. Using full synthetic may help the smoke because the synthetic oil will not burn. You can also go 10,000 miles between changes. (Watch your oil level though since you will not be changing every 3000).
WHITE smoke? Or BLUE smoke? White smoke is usually caused by burning antifreeze (possible blown head gasket). Engine oil burning causes a bluish colored smoke.
Changing the oil two months ago means absolutely nothing to me. I have customers that travel 6000 miles or more in a month. Oil consumption is measured in volume over miles, not volume over months. It is normal for most 4 cylinder engines to use a little less than 1/2 quart in 1000 miles (even more than that for 6 cylinder and 8 cylinder engines).
Take it back and have the heads redone. Sounds like they left oil seals out or they didn't find a crack in the other head. It is very unusuall for oil to come from the exhaust and not smoke. And if the oil is coming from the exhaust gasket ,then the mechanic also didn't do his job right. This gasket should be tight, no air or anyhting else should be coming from between the engine and exhaust manifold. The never timed it is impossible, as it has to be timed to run. I would probably take it to anoher shop, explain what has gone on, get an estimate to fix it. And demand the other shop pay for it.
:sewing machine" sounds are usually caused by low oil. It may be that you are using too light a viscosity oil. Try using a heavier oil. The white smoke is troublesome. This is usually cause by burning coolant! If in fact the smoke is blue you are burning oil,and this makes more sense. The valvce stem seals may be worn out. These squeegy oil from the valce stems to keep it out of the cylinder head. If they are worn the oil is allowed to enter the cylinder head and is burned, causing the oil level to drop, and results in the "ticking" noises. It also uses more gas becasue oil doesn't burn at the tempterature that gas does and slows the cumbustion rate requiring more gas to maintian RPM's.Hope this helps.
the clicking noise could be eiter a valve or piston. the smoke out of the exhaust means different things depending on the color and how much smoke. Check your air filter and make sure oil is not backing up into it. Also, it may be a good ideal to go ahead and change the oil even though you arent at 3000 miles, unless you just changed it. Change the PCV valve also, if itis clogged it will give you problems. Has the check engine light come on?
It's not good to Switch back to Regular oil after using Synthetic. Use the High Mileage oil. It will help a Little. Still Cheaper to replace a Gasket or two than a Rebuild. Got 214,000 + Miles on my 95' Silverado and No Leaks with High Mileage Valvoline 10-40.