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The hard starting problems of diesel engines in below zero / freezing temperatures originate from two factors. One is the original cold air being drawn in to the turbocharger and compressed in to the engine?s cylinder head. The second is the fuel itself, can also be cold which sub zero / freezing temperature fuel is sprayed in to the cold engine?s combustion chamber, where it mixes using the cold air drawn thru turbocharger. 9. Their emotional appeal Though the idea of animal testing might appear trivial, testing is not as simple as smearing cold cream or lip gloss about the face of your rabbit. Animals found in laboratory testing, often go through extremely painful experiments and millions die every year. Those that survive the experiments do not get set free, instead they are euthanized. In cosmetic animal testing; rabbits, guinea pigs, mice and rats are commonly used. Tests are performed on finished products and individual ingredients to look for the products degree of toxicity and capacity to cause eye or skin irritations, allergies and other harmful effects.