

I’ve had a car with where the oil pressure sensor failed; combine that with an oil leak, and you quickly have a major problem. So, what happens when the sensor telling you the oil level fails? A dipstick is extremely unlikely to ever fail to work correctly, so…?
Not where I am; DOT 5.1 costs 2-3 times as much as DOT 5 locally.
DOT 4, $.375/oz.
DOT 5.1, $1.42/oz.
It’s 3.8x more expensive to buy DOT 5.1 locally.