The OS Engines MAX-12TG Ver. 5 is the fifth generation of MAX-12TG, which was developed with the catchphrase "Just the right power". While following user requests and trends regarding the OS, they have pursued ease of use and better performance with each successive generation, and this engine is now in its fifth generation. This time, MAX-12TG Ver. 5 has been improved in various parts in order to demonstrate excellent power even in regulated race scenes.

The first major change in appearance is the addition of one cooling fin to the bottom of the outer head. This improves engine cooling performance and enables stable performance. Also, by increasing the lightweight holes in the fins, the weight increase due to adding one fin is reduced. Furthermore, the head has a new laser design, making you aware that it is "Ver. 5".

Another point that cannot be overlooked is the improved idling performance due to changes in crankshaft timing and improved carburettor. Furthermore, the shape of the combustion chamber in the inner head has been changed to improve combustion efficiency and increase torque in the mid-speed range. The engine has evolved into one that combines ease of driving and strength.

The MAX-12TG was designed to be used by many people regardless of skill or experience, from beginners who are making their touring car debut with this Ver. 5, to users who want to participate in races and achieve good results.