If you have not found the oil plug or the filter, then I assume you looked at the oil only on the dip stick. First, the white streaks are most likly condensation (moisture),not a big deal. Second the oil filter is on the pass. side, underneath up in side a little. The canister has a bolt hex head on the bottom. The oil drain is on the drivers side, bottom of oil pain, allen style bolt.
Cheers

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Stable:
1973 450sl
1978 red diamond ice vette
1975 steel blue convertable vette
2002 steel blue dakota quad.