Anyone remember in the 60's (no wisecracks from our younger members, OK?) when Castrol GTX claimed it had "liquid tungsten." It cost $1.25/qt when other good motor oils were probably $.45 to $.55 (tops) per quart. When I was ready to change it out, the service station guy who changed it for me (I didn't change my own oil then) said he ought to drain it from my car and put it in his!!!! Anyone know what was REALLY in that stuff?