Originally Posted by NattyBoh
Originally Posted by ZeeOSix
Originally Posted by NattyBoh
Then he was saying well it thicker cold and thinner hot ...
Yes, basically every liquid on earth gets thinner as it heats up.
The oil viscosity rating numbers are at two different temperatures. There is no connection between the first "W" (cold rating) and the last number (hot rating).
Ahh. I know it gets thinner as it heats up but then.... whatever lol Im confused on how it goes from a 5 weight to a 40 weight. Or it doesnt? Then why use a 5w40 for cold temps , to improve/help cold starts right? Because the film strength/weight is lower when cold?
In a simple nutshell.
5W-30 is thinner at cold temps than 10W-30. The "W" number is lower.
5W-30 and 10W-30 are essentially the same viscosity at hot 212 F (100C) temperature. The 2nd numbers are the same.
5W-30 is thinner than 5W-40 at hot 212 F temperature. The second number is lower, so it's thinner at 212 F.
You have to compare the first to the first number, and compare the 2nd to the 2nd number. The lower the number, the thinner the oil under the same conditions.
Originally Posted by ZeeOSix
Originally Posted by NattyBoh
Then he was saying well it thicker cold and thinner hot ...
Yes, basically every liquid on earth gets thinner as it heats up.
The oil viscosity rating numbers are at two different temperatures. There is no connection between the first "W" (cold rating) and the last number (hot rating).
Ahh. I know it gets thinner as it heats up but then.... whatever lol Im confused on how it goes from a 5 weight to a 40 weight. Or it doesnt? Then why use a 5w40 for cold temps , to improve/help cold starts right? Because the film strength/weight is lower when cold?
In a simple nutshell.
5W-30 is thinner at cold temps than 10W-30. The "W" number is lower.
5W-30 and 10W-30 are essentially the same viscosity at hot 212 F (100C) temperature. The 2nd numbers are the same.
5W-30 is thinner than 5W-40 at hot 212 F temperature. The second number is lower, so it's thinner at 212 F.
You have to compare the first to the first number, and compare the 2nd to the 2nd number. The lower the number, the thinner the oil under the same conditions.