RE: SK 90-WOW
Turk1,
The OS#8 may be suitable as far as its heat-range is concerned.
However, it is not a 'long-reach' glow-plug.
OS made it (and a few more of its standard glow-plugs) 'medium reach', so it is situated recessed in the combustion chamber.
There are many long-reach glow-plugs available, even from OS themselves (the [link=http://www3.towerhobbies.com/cgi-bin/wti0001p?&I=LXSBW9&P=ML]LC4[/link]), which are as good and even cheaper than the #8.