Draining the oil overnight, and oil dilution have already been addressed. Draining oil is a start and addresses the oil, but doesn't address the need for preheat, with or without having prepared the oil.
Oil dilution is a function of mixing a lubricant and a solvent and does result in chemical changes to the oil, as previously discussed.
Radials have used oil dilution in some cases, but so have horizontally opposed recip engines. With good reason, this option is no longer offered in airplanes such as the Cessna 206 (where it was once a common option), and oil dilution has been removed or deactivated in nearly all light airplanes.