I'm currently running RL 5W-40 in a 2000 LS1 V-8 (all alloy GM late model, for those who don't know). Should I even bother with anything else (LC,LM Cera Tec, Oil Extreme, etc.)?? Will the moly based suppliments "poison" my engine with too much moly (given the very high dose already in the RL)? I am not looking to increase the viscosity at any temp as it is borderline too high now with the RL, just reduce friction to the max possible. Comments/suggestions/leave it alone??