Maybe it was contaminated by someone... Unfortunately the dip stick isn't exact so you might not be seeing a big change. Best bet is to flush and see from there. That will be the least expensive opton and good place to start. Let us know how it goes..Good luck!!!! 
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Badboy S
2000 Porsche Box S arctic silver
2007 Sierra Crew Cab Z71
1995 Honda Civic *Track Toy*
1971 Olds Cutlass Convertible
1968 Camaro SS 396 4 speed
2000 V Star 1100
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