SO far I am really likeing how Redline is performing in my car. The engine runs so smooth and quite. We know that Redline is heavily ester based. It did not smell like gumi-bear like pscholte thinks GC smells like. It also did not smell like auto-rx. It smelled like any other oil to me. It still revs just as effortlessly as before. Temp last night was 25F and it started just fine! Weight of oil is 5W40.