when to take an oil sample?

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59
Location
New England
I have 6 track days on GC castrol 0w-30 and want to take a sample, should I do it right after pulling the plug? don't want to drain all of it if its still showing good reserves rob
 
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2,248
Location
Chicago IL
I've gotten different directions on that from different labs. You also have the filter if that's advisable and accessible. Blackstone said middle of the drain, IIRC and another one said right away to capture the heaviest particles. If you take the sample the same way every time it should eliminate the variable.
 
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143
Location
Virginia
I understand you should take it when the oil is hot right after a good run. And take the sample after the oil has been flowing for a few seconds - if taking it from the drain plug. If you are drawing it via an extractor through the dipstick tube, you should draw the sample from a level about half way between the full and empty on the dipstick... you don't want to be taking the sample from the bottom of the oil sump. I suppose that if you take it from the drain plug but don't want to do a full oil change, you can capture the drain oil in a clean catch pan and simply pour it back into the engine after filtering it through some cheesecloth or a fine mesh filter.
 
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39,777
Location
Great Lakes
 Originally Posted By: rlme36
I have 6 track days on GC castrol 0w-30 and want to take a sample, should I do it right after pulling the plug? don't want to drain all of it if its still showing good reserves rob
Get yourself a sample pump. Blackstone sells them, among others. Comes in handy in such situations if you don't want to drain the oil.
 
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