Ref - L-OS71605100 -
More specialist for higher nitro applications. Top quality from O.S. If you are running 10% Nitro and up, try one of these. Recently the A5 has been renamed the O.S10 - if you ask for an O.S 10 or an A5- we know what you mean!
Glow plugs are considered to be consumables - But by using a low voltage to start ( under 1.5 volts) and not burning the plug dry, you prolong the life of your glow plug. It is also worth washing out a new engine after running in to prevent small particles shorting the plug and destroying it. Blowing plugs on new engines is less common now a days, but is still something that can happen.