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Sounds like they're attempting to deflect responsibility for your potential engine problems.
On the FSS equipped vehicles, MB goofed big time. They installed dino-oil from the factory, and then mandated 15,000+ kilometer oil change intervals. That's at least twice what most people feel is a comfortable interval.
Now, MB is experiencing some sludge-build-up problems with the engines in early FSS vehicles. They were sued in the US, and lost big time. Every 1998- FSS vehicle now has a 150K-mile engine warranty (US only).
Now the trick is to prove that your engine problem exists, if you are using too much oil. For starters, MB's idea of too much consumption is pretty high. It's something like 1 litre every 800 kilometers, or something like that. If you do meet that expectation, then you might have a claim.
The dealer may try to send you home thinking you goofed by using the wrong oil.
Go ahead and use 15-40 if that viscosity owrks in your climate, but 10-30 probaly works fine too. I've been using 10-30 Mobil 1 in our cars, and like it. It flows to a ridiculously low temperature (I live in the Frozen North) but seems to provide good warm weather protection too. The 20 "point" viscosity gap also means no viscosity enhancers, which break down before the oil.
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