This is a weird problem I have faced and there seems to be no solution to this even after having given the car to my mechanic 3 times. Whenever I drive my car uphill even for a little while, like 5-10 minutes, the engine oil light starts blinking, and keeps blinking. And as I go downhill/flat road for sometime, the light goes off by itself. And this keeps repeating everytime a uphill/downhill comes. Now my work is such that i have to travel to a uphill town and come back down to the plains often. It's around 200 km round journey. What could be the issue?
Some background: It's a 2012 VW Polo Diesel engine. I live in India, so the engine oil light is only red (not yellow and red like in Europe, I guess). I have got it serviced for this issue 3 times now in 2 months, but no end to it. The shop changed a seal, a gasket and whatnot. But nothing seems to fix it. Now the mechanic is telling me that it's due to the gradient. It does make sense, because that's what I have observed too, but this wasn't happening before, so why now?
Thanks a lot for the help.