10W 30 vs. 5W 30 Mobil 1
- Thread starter alaskaman
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Dawg4Runner
New member
Great deal! I just got 3 cases of 5W-30 from Costco yesterday.
Definitely go with the 5W-30.
1. It's what Toyota calls for (at least my 2008 V8).
2. It's cold where you live.
From Mobil:
"The lower the number (0W is the lowest), the lower the temperature the product can be used. So the W grade is related to the lowest temperature your engine sees when you start the engine on the coldest morning of the year. But also keep in mind that a lower W grade pumps and helps an engine to start better than a higher W grade. The second part the viscosity grade is related to the viscosity your engine sees at operating temperature. In this case, a higher number is a higher viscosity grade and provides more viscous oil at operating temperature than lower viscosity grade oil. It is not safe to assume that a higher viscosity oil is always better for your engine because other factors, such as engine design, fuel economy and power, are also related to operating viscosity."
Definitely go with the 5W-30.
1. It's what Toyota calls for (at least my 2008 V8).
2. It's cold where you live.
From Mobil:
"The lower the number (0W is the lowest), the lower the temperature the product can be used. So the W grade is related to the lowest temperature your engine sees when you start the engine on the coldest morning of the year. But also keep in mind that a lower W grade pumps and helps an engine to start better than a higher W grade. The second part the viscosity grade is related to the viscosity your engine sees at operating temperature. In this case, a higher number is a higher viscosity grade and provides more viscous oil at operating temperature than lower viscosity grade oil. It is not safe to assume that a higher viscosity oil is always better for your engine because other factors, such as engine design, fuel economy and power, are also related to operating viscosity."
Dawg4Runner
New member
I just saw this part about being in SD. Still go with the 5W-30 regardless of where you are since its the second number that's important for operating temps.
Gerdo is CORRECT. The journals the oil has to pass through may or may not be too restrictive for 10W-30 oil. 10w-30 is really just 10 weight oil with additives that when they get hot uncoil and makes the oil behave like a 30 weight oil. And 5W-30 is really 5 weight oil with additives to make it act like 30 weight when hot.
Not all engines have these tighter tolerances. But some do. I surely wouldn't take the chance of running 10w-30 in an engine that the engineers who designed the engine say you should use 5w-30.
