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On the same side as the dipstick and directly underneath the dipstick is the drain plug. Its a 17mm bolt head. Definitely drain and add new.
Oem SC oil is fantastically expensive. I also use GM SC oil, and it aint cheap! Some people even use a pure synthetic motor oil. The bearings on SC's are weird, it could even be possible that the oem sc oil is formulated not to ruin the SC's bearing seals. Dunno.
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