I wouldn't use any sort of motor-oil to lube the cables. It might be fine for a while, but it'll start to collect dust and dirt, and the the cables will not function properly (they'll get gummed up, and will also be affect by cooler temps). There is a proper light-weight oil specifically designed for cables. I've never had a problem with the cables using a specific lube. It is lightweight, but seems quite slippery. The stuff I have is called "PJ1" Cable Lube. Claims to entend cable life, cleans & lubes, and is easy to use. That's what's printed on the can. It sprays on, much like WD-40 does, but doesn't evaporate. They have a website - www.pj1.com.