Manual transmission fluid
26,000 miles ago I refreshed my trans fluid with Penzoil Synchromesh. Recently a Jeep friend advised I drain it out and replace it with Redline GL-4. When I drained the Penzoil out, though the oil was clean and fresh, the pan was FULL OF BRASS! Holy crap, has the Penzoil done that much damage to my synchro’s in just 26,000 miles?