O.S. Engines have introduced their new O.S. Speed Gold glow plugs. Building on the success of the recently introduced limited edition #80 plug the P3, P4, RP6 and RP7 turbo-style plugs complement the already existing range with the P3 and P4 offering improved low to middle-range power and quicker response to throttle inputs, allowing for quicker spool up and also more stable idling. The different idling characteristics will also be acoustically noticeable. As for the RP6 and RP7, both glow plugs will also offer improved low-end power and quicker spool-up. The glow plugs become available by October.