Quote:
Originally Posted by Ben99GT
Not true...
Motorcraft Full Synthetic 5W-20 cSt @ 40°C (the W rating)- 45.9
Motorcraft Full Synthetic 5W-30 cSt @ 40°C - 60.0
GC 0W-30 - 66.8
The higher the number the more viscous the oil.
And just for giggles:
Castrol Syntec 10W-30 cSt @ 40°C - 59.6
GC, despite being labeled as a 0W oil, is actually thicker at 40°C than either MC 5W-30 or 5W-20 and is much thicker than Castrol's own 10W-30. Marketing at its finest.
5W-20s tend to run notably thinner at 40°C than 5W-30s. There can be significant viscosity variations on the same grade oil from brand to brand despite what they are labeled. The only real way to tell is to look at the PDS.
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You realize that 40C would not be considered "cold" weather? 40C is about 100F
However, I agree with the above, Ford only went to 20w for the tiny fuel effiency improvement. 30W works if you are going to run it hard.
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Last edited by 01vert; 03-26-2009 at 07:14 AM.
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