Here's a photo of the back of my most recent Rotella 5w-40 synthetic oil purchase. It shows the oil to be CG-4/SM rated. I assume this means I shouldn't use it im my wife's Spyder or my C50?
I think you got the wrong version of Rotella:
This one meets the requirements:
ROTELLA® T Synthetic
Fully synthetic heavy-duty engine oil.
Approvals and Recommendations
API CI-4 PLUS, CI-4, CH-4, CG-4, CF-4, CF
API SL, SJ, SH
Cummins CES 20078, 20076, 20071
Detroit Diesel 7SE 270
Mack EO-N Premium Plus ’03, EO-N, EO-M Plus
Volvo VDS 2
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This one does NOT:
Shell Rotella® T Synthetic with API CJ -4 Technology
Specifications and Approvals
5W-40
API: CJ-4, CI-4 PLUS, CI-4, CH-4, CG-4, CF-4, CF
API: SM, SL, SJ, SH
Caterpillar : ECF-3, ECF-2
Cummins: CES 20081
DDC: 93K218
Ford: WSS-M2C171-E
Mack: EO-O Premium Plus
MB Approval: 228.31
Volvo: VDS-4