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TECH: 16V Oil cooler



After running Windy (my Scirocco) with the Perpetual Oil Changeâ system enabled for the last week or so while my spoiled ass waited for warmer weather, the oil cooler o-ring finally decided it wasn't happy being cold and disintegrated entirely when I started the car this morning.
 
Pretty amazing how much oil came out in such a short period of time - I started the car and drove maybe 20 feet when the oil light started flashing (no buzzer). I looked in the mirror to check traffic behind me and noticed a nice thick stripe following me, turned the car off just as the buzzer came on too. About 3.95 quarts in 20 feet make a pretty ugly adornment for pavement. Also makes it pretty easy to pinpoint the offending vehicle :(
 
At any rate, I don't think I hurt the engine as I got it shut down pretty quickly. Now I just have to drive the pickem'up until I can't stand it or we catch a warm spell since the Cabby is disassembled in the garage...
 
When I do go to tackle this, what size is the nut under the oil filter that holds the oil cooler in place? IIRC, it is pretty large and I don't think I have an open-end bigger than 24mm. I'd rather have the right tools before I get started, so thanks for your help.
 
Also, which sender controls the blinking light and which triggers the buzzer, or are they both handled through the DOPS circuit?
 
Thanks again.
 
Cheers,
 
Christian
87 16V