What is the brass-ringed hole called on the the oil tank, next 2 the oil filter, on an N-reg Vauxhall Corsa?

Question

I recently bought a second hand Vauxhall Corsa and after a long drive of around 200 miles, the car developed a problem and shuddered to a halt. All the oil had drained and it looked on closer inspection to have drained from a small brass-ringed hole at the bottom right hand side of the oil tank (not the sump), near the oil filter. Having looked at a neighbour's M-reg Corsa it looks like what's missing is a transparent 'plug'...

Until I can ascertain WHAT is actually missing or get it towed to a garage (limited as I work shifts) and have a professional (expensive) look at it i'm gonna just have a lump of metal at the end of my drive...

Answer 1

Sight glass.

http://www.jwwinco.com/products/section12/gn537/index.html

Answer 2

those engineers have a boatload of e book discovering and no useful experience. The oil itself would not wreck down however the ingredients do and between the roles of oil is to assemble the contaminants from combustion and condensation and keep it in suspension so it would not abrade or corrode the metals that would quite be rubbing against one yet another. It was once that we replaced oil each 2000 miles yet oil is getting greater effective each and all of the time. ok, it isn't the oil this is getting greater effective however the ingredients. we are utilising an identical oil now as then, yet with greater effective ingredients. That mixed with greater effective metallurgy means that we can bypass extra between oil differences now. 3000 to 5000 miles gazing considered one of those provider you're submitting your motor vehicle to. and alter the filter out. don't be cheep in this one. changing your oil is cheep whilst in comparison with changing your engine, or procuring a clean motor vehicle.