In prepping for the winter here in Detroit, I decided to check the anti-freeze level on my Universal M-18. The fluid is an awful, murky brown, which i've never seen before. What to do? Radiator flush and re-fill? Anything else? Why the discoloration now when it was fine the last several years, have I finally worn it out? I was planning on using Sierra to replace the fluid, is that OK?
Bob Mann
