Thanks for the reply,

I think the first number (0W or 5W) refers to the viscosity at startup, the lower the number the easer for the engine to crank itself,therefore, greatly reducing wear and tear. So having said that, wouldnt it be better to buy an oil with a 0W instead of a 5W to greater reduce wear and tear? As soon as the engine warms up, the second number is what's significant throughout the rest of the drive. I know the manual recommends 30 weight oil for the prius, but interestingly, i logged on to the canadian website and consulted the maintenance page and this is what i found out:



Near the bottom it says 5W20 and 5W30 motor oil only.

I spoke to someone at a local dealer about this and he denied toyota recommending this oil to them


So my quesion is, has anyone used 20 weight oil for their prius with no adverse effects?
if yes, then i'll go and pick up 4L of 0W20 Mobil 1 oil today. The 5W20 is not available here, i havnt seen it anywhere.