The question of our Shell Rotella oils harming catalytic converters has many dynamics to it. We typically do not recommend our Rotella oils to be used with relatively new cars. They have a boosted amount of zinc that may harm the newer catalytic converters. They may be OK to use in certain older vehicles (depending on OEM requirements) from 2000 and older.
Our Shell Rotella oils have API SM (gasoline) and CJ-4 (diesel) ratings. That rating will be able to cover previous API service requirements, but not the current API SN rating.
1987 Porsche 944 is asking for an SF rating on your oil; our Rotella oils will be able to meet that specification.
1997 SAAB 900se is asking for an SG rating; our Rotella oils will be able to meet that specification.
2009 Subaru WRX is asking for an SM rating; our Rotella oils will be able to meet that specification, but we would not recommend you to use it for this vehicle.
2009 Ninja 650R is asking for an SJ or a JASO MA specification; our Rotella oils will be able to meet that specification, but we would not recommend you to use it for this motorcycle.
Depending on the year or your VW Jetta TDI, we recommend using Rotella if your vehicle is from the year 2000 or older.
As for the JASO ratings, only our
Rotella T Triple Protection 15W-40 and our
Rotella T6 5W-40 are JASO DH-2, MA, and MA2 approved. the
Rotella T5 10W-40 is only JASO DH-2 approved.
If you have further questions, please give us a call at
1-800-237-8645, option 3,2.
Regards,
Technical Information, hn