I would tellt he dealer if it isn't an issue, then why dont they check the guides and show you them.

I'm no pro though, but thats what I would look to have them do. it can't be that hard for them to pull the valve covers and check the guides..

Alon

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'92 300CE - Sold
2004 C240 - 744 - C7 Wheels - Android Radio
2002 C320 - 816 - Sport Wagon - Sold
2006 E350 Wagon - 368 - Dead
2015 GL350 Bluetec - 197U