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#22: 04-22-2008, 03:39 PM
 
 fishbone
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Title: Eurotrash
Location: Texas
Car: 05 Legacy GT
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5W40 is OK with our engines per the user manual 0W40 is basically less viscous at cold start. Manual states:
From -35F to 100F use 5W30
0F to 120F 10W-30 or 10W-40
We get triple-digit temps here sometimes.
Why 40 instead of 30? Because it seems that per my last UOA the Mobil 1 5W30 still allowed some higher than average wear [had higher readings of iron, amongst others]

Last edited by fishbone; 04-22-2008 at 03:43 PM..