A mechanic seems to have used engine oil to lubricate throttle linkage. Is it good?

I think it is engine oil because the spill under the linkage onto engine has the same color as the spill around breather hose and oil fill cap.

The MB maintenance CD file suggests "only ATF" to lubricate those linkages.

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1992 300D 2.5 turbo diesel. 319 k miles.
124.128 chassis, 602.962 engine, 722.418 tranny.