Can I take a UOA sample from the oil filter?

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Jan 16, 2003
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Now I KNOW this is not the proper way to do things, however.... I was helping my Dad change oil in his '96 Buick 3.1L, and we noticed some condensation around the fill cap. I am fearing this may be coolant since this is the dreaded GM 60 deg engine. Can I just pull the filter and collect my UOA sample from there, or do I need to dump the new oil? I am not worried about accurate insoluable readings... just looking for Potassium and Sodium. If this is a bad idea, let me know why.
 
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Is this a new filter on the car? So it's got new oil and a new filter. If that is the case, just loosen the drain plug and get a small sample out of there. No need to dump the lot. Any large amounts of water will be sitting under the oil anyway. Dave
 
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Forget the filter sample unless there is just no other choice ( catastrophic failure with total loss of fluid in a forensics situation). Loosen drain plug and allow a clearing stream of 15 or 20 seconds and sample, tighten plug. Better yet procure a fluid sampling pump that is easily cleanable and with fresh PCV tubing sample through the dip stick access. Find a CAT dealer nearby to procure the hand pump.
 
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