0W-20 motor oil on a new Jeep
#21
This comment is absolutely correct. The lower the number, '0' in this case, the better the start up protection. The temperature has no bearing on it. So, running 0-20 or 0-30 is fine. All those who say that they run a 10 weight or even a 20 weight oil because the air temperature in their neck of the woods is over a certain degree are totally misinformed.
#22
JK Junkie
This comment is absolutely correct. The lower the number, '0' in this case, the better the start up protection. The temperature has no bearing on it. So, running 0-20 or 0-30 is fine. All those who say that they run a 10 weight or even a 20 weight oil because the air temperature in their neck of the woods is over a certain degree are totally misinformed.
Depending on brand oil, at a given temperature a 5w-XX may be thinner than a 0w-XX.
don't take my word for it. look up your favorite oil's PDS.
For a readily accessible example, Mobil 1
5w30 @40C, 61.7cSt
0w30 @40C, 62.9cSt
So on a hot summer day, the 5w30 is thinner at startup. Sub-freezing, it's a different story.
The designations of grade are not absolute values, they are ranges that oils have to fall into under certain conditions. And the relationships are not linear.
Use any top brand-name oil, keep it at the appropriate level on the dipstick and change it on a schedule as simple as following the oil life monitor and lubrication will not cause the early demise of the JK.
#23
JK Enthusiast
My wifes 2012 also states 5W-30. I use the 5W-20 in it. I think they found it works better all around on VVT engines. There is so much engineering on oil that these discussions will never have a positive, absolute answer!! I use the Mobil1 also.
#25
#27
#28
JK Enthusiast
That's not true. Temperature absolutely has bearing on it. But since we are splitting hairs...
Depending on brand oil, at a given temperature a 5w-XX may be thinner than a 0w-XX.
don't take my word for it. look up your favorite oil's PDS.
For a readily accessible example, Mobil 1
5w30 @40C, 61.7cSt
0w30 @40C, 62.9cSt
So on a hot summer day, the 5w30 is thinner at startup. Sub-freezing, it's a different story.
The designations of grade are not absolute values, they are ranges that oils have to fall into under certain conditions. And the relationships are not linear.
Use any top brand-name oil, keep it at the appropriate level on the dipstick and change it on a schedule as simple as following the oil life monitor and lubrication will not cause the early demise of the JK.
Depending on brand oil, at a given temperature a 5w-XX may be thinner than a 0w-XX.
don't take my word for it. look up your favorite oil's PDS.
For a readily accessible example, Mobil 1
5w30 @40C, 61.7cSt
0w30 @40C, 62.9cSt
So on a hot summer day, the 5w30 is thinner at startup. Sub-freezing, it's a different story.
The designations of grade are not absolute values, they are ranges that oils have to fall into under certain conditions. And the relationships are not linear.
Use any top brand-name oil, keep it at the appropriate level on the dipstick and change it on a schedule as simple as following the oil life monitor and lubrication will not cause the early demise of the JK.