what the fonction of this?

[grinder]

are you SURE its for oil ??

im CONVINCED that its not for oil

[Prof]

I think Grinder is right - that looks like the cold start reservoir - which is for mostly antifreeze.  There is a sensor on the oil sump (basically a switch) which triggers this circuit - this stuff is fed into the engine to help with startind during sub zero temps.
 
It\'s more common to find them on Canadian RX\'s and in the colder parts of the USA - never actually seen one in the flesh.
 
see attached bitmap

[grinder]

thanks prof

and for even more proof :

http://www.rx7club.com/showthread.php?t=680070&highlight=cold+start+assist

[-JFK-]

big thanks grinder and prof
 
you are the best :cheers

[grinder]

we aim to please