Sorry if this has already been discussed but my car is spec'd for 5w20 but here in Canada we get horrible winters as cold as -40 fahrenheit some days so a 0W20 obvs wouldn't hurt. I was doing some reading and seems like I read some posts about some people say "if you run 0W20, watch out for leaks"
I just dont understand how thats possible unless I am misinformed. A 0W oil will be less viscous compared to a 5W oil at a cold temperature, whatever the benchmark cold temp is. And then the second number is at operating temp and at this case they are the same.
For example, lets say its cold out. then a 5w20 would be viscous and as the temps heat up in the engine, it would slowly heat up and become less viscous until it reaches that 20 grade. However when a 5W20 is heating up, it would obviously be less viscous compared to a 0W20 that is cold right? In that case, If a 0W20 was said to cause leaks then in this same scenario wouldn't the 5w20 cause that same leak when it is warming up/engine is getting to operating temp? or am i missing something here