I own a 2016 Kia Optima 1.6L LX Eco-T. It has 127,000 miles on it, all highway. My question is about 2 weeks ago I heard a tapping sound coming from the engine, when I stopped and checked the oil, there was none on the stick. It took 4 qts to get to the fill line. The next day, I took it back to the dealership that has serviced the since I bought it new and they said I need a new motor. I questioned them on how it could have been 4 qts of oil low, since it was just in for service 6 weeks, 4950 miles, prior to this and how there is no oil leak, no smelling of burning oil or sight of the classic blue smoke out of the exhaust. Their answers were as follows, the turbo could be bad and with technology today, you wouldn’t see or smell the oil burning. I believe they are lying and that 6 weeks ago their mechanic forgot to put new oil in the engine, when they serviced it. Can someone else please explain how this could have possibly happened to the engine???????
RAther than fight about hypotheticals, just perform an oil consumption test. Change the oil and then check the dipstick once a week until the next oil change. The amount of oil used was either burned or leaked. If the amount it used is excessive, then do a compression and cylinder leakdown test to determine valve and piston ring/cylinder wall condition.