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.
A lot of people don't understand oil ratings on the multi visc oils. The W in 10W40 stands for winter. The low number is the cold rating, any 10W oil being no thicker than a straight 10 weight oil when cold.The high number is the hot rating, meaning a 10W40 would be no thinner than a straight 40 weight oil when hot.A 10W30 would be thinner than 10W40 when hot.he W in 10W40 stands for winter. The low number is the cold rating, any 10W oil being no thicker than a straight 10 weight oil when cold. The high number is the hot rating, meaning a 10W40 would be no thinner than a straight 40 weight oil when hot. A 10W30 would be thinner than 10W40 when hot.