If you have an uncoated steel cable, lube it. If you have a Teflon coated cable, don't lube it. Always grease the cable ends.
in order of ownership
1971 Honda CB350, 2 1973 Honda CB500s, one was stolen, 1974 Can-Am 175 TNT, 1978 Yamaha XS11, 1978 Honda CX500, 1975 BMW R90S, 1983 BMW R65LS, 2005 Suzuki DL650 totaled, 2007 Suzuki DL650A, 2012 Suzuki DL650A