After years of trying about everything, I now have settled on these:
"GLIDEX" BALL & BRONZE BEARING SUPERIOR AEROSPACE (Mil Spec) LUBRICANT.
This synthetic lube willnot dry in your car's bearings and cause dirt build-up while reducing friction in extreme heat and difficult circumstances. A must for any electric model car enthusiast!
"VOODOO" COMMUTATOR DROPS AND BRAID ANTI-BURN TREATMENT. This
extraordinary lubricant has multiple uses:
-A drop on a motor's commutator gives new power to failing motors.
-A drop between chassis components improves their handling and performance.
-Use for lubricating plastic and metal parts.
I was convinced after we actually did some comparison tests and this stuff made a REAL difference.