It is more like 6.8 quarts if you have the oil cooler, 6.3 quarts without the oil cooler. This is per the service manual for the 68-71 280sl.

__________________
Regards,

Tom S.
1971 280SL Tunis Beige Metallic
1971 280SL Tobacco Brown (13K miles)
1970 280SL Deep Red
1994 E320 Cabriolet
1999 E320 Wagon 4Matic
2002 LX 470
1992 Land Cruiser