You don't mention how many miles are on your engine. If your engine is "seeping" any oil, it may become a leak when you switch to synthetic. Not that it definetly will, but it is known to happen. Also, synthetic oil likes like a cleaner in your engine. If your engine is gummed up in any way, synthetic wil loosen it up and possibly plug up the works inside. You could first switch to semi-synthetic, to "ease" the engine into full synthetic oil.

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1999 MB SL500 (110,000 mi)
2004 Volvo V70 2.5T (220,000 mi)
2014 Tesla Model S 85 (136,000 mi)
MBCA member