My anecdotes don't include much better performance than people using regular oil. I only saw 50MPG at 70MPH after using Amsoil, but non-synthetic people see it too.Daniel said:I've read speculations about getting better mileage with synthetic, and I'd use it if I had evidence that this was the case, regardless of cost, just for the bragging rights. But I've seen no hard evidence. Just speculation and anecdote.
What about cold-weather starting?Phoenix said:so the worst thing that the ICE faces is probably contamination from dirt and water in the crankcase. And, synthetics won't help there. The only thing you can do is change the oil.
andrpm said:What about cold-weather starting?
Toyota says you don't need synthetic oil. And they know their engine. The starting method in the Prius is unlike any other car, and so greatly reduces stress that special oil is not needed. Witness the Classic, which is starting to demonstrate some very high-mileage examples. It uses the powerful MG1 and the big HV traction battery to spin the engine up to 1,000 rpm before giving it fuel and spark. Other cars use a little starter motor and 12-v. battery barely able to turn the engine over, and pump in fuel until it catches.SLowen said:... As much as the Prius starts and stops the engine, I would think having a synthetic lubricant which has much better shear characteristics would be better plus it is not oil and it is made in the USA.