Oil Games ?????
You can also put in a different oil providing it meets MB's requirements. Check out this link Oil Recommendation
Since your car is a '99, it probably has 229.3 specs for oil.
Regards,
paul...
The SL/CF would have come out earlier
The SM/CF forumulation will be a newer iteration.
For example, I have an old plastic quart bottle of oil that I use as a funnel (with the bottom cut out) that is from 20+ years ago that was API SE/SF and about 15 years ago the API SH designation was out.
So the newer forumulation is fine to use in your car as it will meet the MB oil spec.
Mobil revises their packaging designs from time to time as well, so what we have today may likely change on the label in a couple of years from now.
I've been using Mobil 1 for 15 years now, and there's been a lot of changes in the product packaging over the years...



