AXE ROSSI Glow plug R4 (10904)(Other parts)
R3 -3,5-6 c.c.
R4 6-10 c.c.
To work out which temperature plug to use, you need to know how much methanol is in your fuel, not how much nitro or oil.
As a rough rule of thumb;
80% methanol or above, use a hot plug.
70%-75% use a medium plug.
60%-75% use a cold plug.
65% or less use a very cold plug