Glow plug

[arvi]

Hi,

I have a HPI .21 nitrostar F3.5 engine and as standard it comes witha R5 glow plug. This plug is meant to be cold. I have a couple of question

1) Can I use the McCoy MC9 as its easier to get hold of and is also in the cold range

2) In the litreature it says the R5 glow plug is for hot summer days. So what plug can I use for cold winter days.

Thanks