Heat Ratings. The output of a radiator is measured in British Thermal Units (BTU.s) per hour. (So is air-conditioning, come to that!) 3000 BTU is roughly equivalent to a 1 kilowatt bar heater, just to give you some idea.
Rating Newest Oldest. Best Answer: The difference between 5w30 and 10w30 is that 5w30 flows better at colder temperature. If you live in a place where it gets cold often, or during the winter time, you will get better results using 5w30.Otherwise 10w30 oil is good enough, i usually use 5w30 all year round.ating Newest Oldest. Best Answer: The difference between 5w30 and 10w30 is that 5w30 flows better at colder temperature. If you live in a place where it gets cold often, or during the winter time, you will get better results using 5w30.
Viscosity (a fluid's resistance to flow) is rated at 0Â° F (represented by the number preceding the W [for Winter]) and at 212Â° F (represented by the second number in the viscosity designation). So 10W-30 oil has less viscosity when cold and hot than does 20W-50.Motor oil thins as it heats and thickens as it cools.So, with the right additives to help it resist thinning too much, an oil can be rated for one viscosity when cold, another when hot.o 10W-30 oil has less viscosity when cold and hot than does 20W-50. Motor oil thins as it heats and thickens as it cools. So, with the right additives to help it resist thinning too much, an oil can be rated for one viscosity when cold, another when hot.