are you talking about your oil pressure or your oil level? the oil pressure gauge reads from 0 to 3, and should probably stay pegged at 3 while driving. Is that what you are talking about? if it goes below 1 and the car rattles I think you might want to stop driving it until you get the oil pressure corrected.

cdt

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2002suzukiGSF600S
1985 190e 2.3