A mixture of turpentine and 30 weight motor oil works well. The turpentine thins the oil and decreases the surface tension and increases wetting, allowing excellent penetration. Then, as the turpentine evaporates, the oil is sucked farther into all the tiny spots it wouldn't normally reach.
For hard to reach places, a syringe tipped with a plastic straw works. Yeah, you'll smell the turpentine for a bit, but it will be a long lasting lube.
Bit o' trivia: WD-40 was designed as a Water Displacer. It's lubricating and solvent properties are just a happy coincidence.
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