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Agreed about WD40 its not really needed around an RC, and can actually wash away the good grease you want to keep. Also agreed big time on pulling a seal on a bearing and packing with grease, i used to use red/tacky i have switched to marine grease, i like it better but its positives over re/tacky are negligible mainly I run boats so its always sitting in a bag right by me. Gotta keep them prop shafts packed at all times.+1
Plain WD40 is a Water Displacer like you stated, But it is no more a lubricant than water is. It is primarily a Solvent, And if not cleaned off well enough, after using it on rotating parts like BB's will ruin them sure. WD40 gums up eventually, while also breaking down lubricants. Fact. Lube should follow. Chromium BB's simply rust no matter what.. I pack my BB's with a grease. extends their life. But they still are consumable parts no matter how you slice it. Only use An automotive grease on the diff gears. Red and Tacky is thick and most tenacious and remains for longer. Use oil on the Motor BB's.