Re: Castrol GTX
what convinced me to try was a hand crank at Canadian tire that both had the same oil, but one had the lucas additive, you could crank both by hand an the one with lucas was easier to turn and it was obvious that the oil was lubricating the gears better. I starting using it in my 1992 Accord with 315,000 Kms. the idle did vary, it was more consistant, it could start in minus 30C without using the block heater and I saw a difference in fuel economy. the oil would stay golden for 5,000KMS instead of 3,000KMS and the engine didnt smell when I would push the engine. I think overall the $7 purchase was worth it. The bottle can be used for 2 oil changes.