I have a question: I see all the advice about not using gear oil in these winches because it will damage the brass (yellow metal) parts. I have used it in our truck winches with STP added to enhance shear strength and add zinc anti-friction molecules for over 30 years and have not seen any damage. Our winches have seen some rather severe service. The question is, if gear oil is so damaging to the brass parts, why doesn't it eat out the brass blocker rings in stick shift transmission and transfer case synchronizers? It has been used in these applications since basically the beginning of time. Yes, there is different oil than gear oil recommended for continuous duty worm and high speed worm drives but the winch drives are not in that classification. My son did a lot of research on this because of the worm drives on industrial machinery at his work place. For drives like our winches the recommendation was straight weight 140.