When looking for an oil to use on your hone, the weight of the oil is the most important thing. Too heavy or light, and it won't float swarf properly and--as you mentioned--can clog or otherwise harm your stone. Neatsfoot oil, sperm oil, mineral oil cut with kerosene in a 50/50 mix are all the right weight. But why do that when honing oil is so cheap? Lansky honing oil is $1 per ounce and works fantastic. Smells nice to boot.