The left rear caliper has stuck on a few occasions after bad weather trips and both rears have pretty significant corrosion (base sliding cast iron calipers) so I ordered a pair of Raybestos R-line replacements, new Akebono ASP pads and 2L of the Pentosin Dot4 LV fluid based on the thinking the car might see -20f this winter but now I am a bit concerned I made a mistake going with a LV fluid for this application. Any insights would be appreciated.