NHTSA Complaint #11424478 — 2016 KIA OPTIMA

My 2016 KIA was consuming 1 quart of oil every 500 miles in 2021. Called KIA dealer about oil consumption issue and they started 3-1000 mile oil consumption tests on 4/6/21 (miles 92,053). On the 1st 1000 mile test, 2 qts of oil were consumed. 2nd 1000 mile test 1.2 qts of oil were consumed. 3rd 1000 mile test 1.5 qts of oil were consumed. All results were reported to KIA. The 3rd oil consumption test was completed on 5/27/21 (miles 95,065) and I went home and checked the oil level on the dipstick, which was filled correctly to the full mark. On 5/28/21 the service mgr called to schedule an engine compression test on 6/8/21. On the morning of 6/8/21, I checked the engine oil and it was more than a qt low (miles 95,510) with only 445 miles since the oil was topped off. Delivered car to KIA for the engine compression test on 6/8/21, told service mgr of the 1 qt oil consumption in 445 miles, and he informed me that if the compression test is good, KIA will direct an engine cleaning procedure per KIA TSB 222. When TSB 222 was completed, they stated another 1000 mile oil consumption test had to be completed. On 6/9/21 I returned to the KIA dealer to pick up my car. Requested to check the engine oil level with the mechanic since this was the start of the 1000 mile test. The car was returned to the service floor, time was allowed for oil draindown, and the mechanic pulled the dipstick which indicated the oil was overfilled by approx 1/3 quart. Took a picture of the dipstick level. The service manager was told of the situation. No action was taken. They sealed the dipstick and I departed. Printed TSB 222 from NHTSA website. On 6/24/21 returned for 1000 mile check. I witnessed (took picture) mechanic check the oil and he said it was less than a qt. I showed service mgr the overfill picture. He change the consumption to 1 qt. Spoke with KIA mgr. He said another 1000 mile check was to be performed. Since TSB 222 states oil is to be filled to full mark, their test is invalid.