Old Oil Question

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In cleaning out my garage today, I came across a few quarts of older oil left over from prior purchases and cars I no longer have. Can anyone tell me if these quarts are still useful? 1. Quaker State 10W40 (SG, SF/CC, CD) 2. Mobil 10W30 (SG, SF/CC, CD) Kent Kester
 
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With the SL specs out, I wouldn't go older than anything SJ vintage. I would toss them also
 

kkester

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My current vehicles are a 1997 Mercury Mountaineer (136,000 miles) and a 2001 Ford Crown Victoria Police Interceptor (15,000 miles). I use Mobil 1 0W20 in each of these. Kent Kester
 

kkester

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Would they be useable in an old (<1995) vehicle if either 10W30 or 10W40 was specified? Or, by virtue of their age, have these oils degenerated? Kent Kester
 

Patman

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The shelf life of motor oil is about 4-5 years, so it seems these ones are past their prime unfortunately.
 
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Xmas gift was a Craftsman lawn chipper/vac and it came with a bottle of 30W oil. It was SG. Wonder if that oil is really really old or they still make this stuff only for mowers etc?
 

Kestas

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Small air-cooled engines heat oil more than automotive engines, hence the recommendation for 30W instead of multiweight.
 
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