"N63 and S63 Engine: Upper Oil Pan Removal and Installation Procedures. INFORMATION When removing and/or installing the N63 or S63 engine ""upper"" oil pan assembly, the oil pan can sustain damage if this operation is not performed correctly. Before loosening or tightening the upper oil pan bolts as per Repair Instruction 11 13 010 ""Removing and installing /replacing upper oil sump (N63),"" the steps outlined in the attachment of this bulletin must be followed. Refer to attached document and the instruction section that applies to the procedure being carried out. The ISTA/D repair instructions are currently being revised."