Oil Sampling

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1,209
Location
CA
I have a previous changes' sample in a blackstone bottle... would I be okay dumping that sample and getting a new sample in the same bottle this change? Or would it skew the readings? What I'd like to do is get a sample this change, switch to Havoline 5w30 for 2 changes and then get another sample to see how my truck does on both oils... any comments? Thanks [Cheers!]
 
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