i guess there is no study or scientific report reviewing these, but in your opinion, would these be worth the 30 or so dollars? Car in question is 1999 beater Solara with a 1MZ-FE. I guess the point is, will an oil pan heater extend the life of the car? It already has 200k miles, but I plan to go to 250k at least. The car is parked in an unheated garage where it does go below freezing. It might get to 10 degrees at the coldest. The car spent the first 12 years of its life in Florida, so cold starting wasn’t as big an issue. What do you think, waste of time and money?