Thread: Does it matter? 5W20 or 5W30 in a non-Hemi.
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Old 08-19-2008, 10:39 PM
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5W20 will reach the heads/cams faster on cold start-ups. Also, the clearances in the engine are designed for the recommended oil.
They recommend 5W20 for a reason.

My 88 5.0 Mustang ha 163K on it and still holds 22psi oil pressure hot @ idle and about 45lbs @ 2000rpm. These are hard miles with lots of NOS used back in the day!!! It still runs like a scalded dog and I have always used the oil recommended for it. 10w40.
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Last edited by lxman1; 08-19-2008 at 10:41 PM.
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