Maybe dirt's the culprit? Under the seat can get dirty, and if someone's not careful dirt can get into the oil when you're refilling, especially as it's faster to take the filter out of the filler opening.
Maybe dirt's the culprit? Under the seat can get dirty, and if someone's not careful dirt can get into the oil when you're refilling, especially as it's faster to take the filter out of the filler opening.
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