Kia Optima excessive oil consumption and engine knocking due to faulty piston ring, known recall issue on Kia Optima

Some Kia Optima owners report experiencing excessive oil consumption and engine knocking, which may be attributed to faulty piston rings. This concern is part of a broader issue that led Kia Motors to issue recalls in 2020 for around 1.4 million vehicles with Theta II engines, including the 2011-2014 Optima models. While a recall exists for the KSDS update related to connecting rod bearing failure, there is no specific recall addressing the piston ring problem, which is suspected to contribute to oil consumption in certain cases. Additionally, some owners have reported receiving service or repairs for this issue, with dealers conducting tests to assess oil consumption levels. It is essential for Kia Optima owners to address these potential issues promptly to ensure the vehicle's performance and safety, and to seek assistance from their preferred Kia dealer if they suspect any problems.