Sienna dude
Thread starter
- Joined
- Apr 12, 2025
- Messages
- 867
Have you asked Toyota about it? Has the coolant thermostat been checked or replaced? Is this a normal issue for this model and year of Toyota engines? One thing I know, which won't solve the problem, on big diesel trucks, tractor trailer semi type truck engines, the coolant temp. should run 200 to 212 degrees f, the engine oil temp should run 20 to 30 degrees over your engine coolant temperature. These numbers, at least on a big diesel engines provide maximum engine life, fuel milage, and performance. What is the coolant temperature reading on that same handheld tool you are showing us the engine oil temperature?