BaZZaD Report post Posted August 1, 2022 (edited) Hello! I need to order new pistons rings and I found on tascaparts that correct part number for my car is K2GZ-6148-A (indicated as Standard) and K2GZ-6148-B (indicated as 0.50mm o/s) I tried to find out what the difference is and in some online stores they told me that the K2GZ-6148-A option was discontinued, others said that option A is standard, and option B is needed after cylinder repair. Not sure what to order. Please help me figure it out. Maybe someone knows or can check with the dealer. Thank you. Edited August 1, 2022 by BaZZaD update Share this post Link to post Share on other sites
chipdog4 Report post Posted August 2, 2022 Why do you need new piston rings? You have to completely take apart the engine to replace them. Standard would indicate factory bore size. The other one indicated as .50mm O/S is oversized for when you have a catastrophic event and the cylinders need to be bored oversized to remove scratches or gouges. 1 Share this post Link to post Share on other sites
1004ron Report post Posted August 2, 2022 BaZZaD What are you planning to do, rebuild and bore the engine, ......... if you rebore then obviously you need the oversize rings that have an increased Outside Diameter. The reason why some places don't stock the standard ring sets is because most folks needed rings have rebored the engine. Share this post Link to post Share on other sites
enigma-2 Report post Posted September 25, 2022 Your engine is only 3-4 years old, and you need rings? What happened, you let it run out of oil? Not trying to be negative, just seems highly unusual for a young engine to need a major overhaul. (My MKX is 14 and still has excellent compression). Share this post Link to post Share on other sites
