2000 500 SL purchased new 9-2000, car manufactured 11-99 now has 1359 miles, 9600 miles to FSS oil change.
Car has been laid up since 11-2000, will start using 4-2001 for upcoming season (live in New England. I anticipate 5-6K mile per driving season and plan to do annual oil change with Mobil I 15-50w.

Question, what oil came with the car from factory ? Can a change to Mobil synthetic now or is ther a breakin period before switch to syn? I sign literature both ways, 1 OK to go to syn and 2. wait 10-15K before switch to synthetic. MB has recommended synthetic for all FSS since 98 according to dealer, no reference in manual.

Any comments??

I believe all cars from 1998 and on came with MOBIL 1 synthetic.

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2006 E350 w/ 155k miles (Daily Driver)

Previous:
1993 300E 3.2L Sedan w/ close to about 300k miles
2003 E500 Brilliant Silver (Had 217k miles when totalled!)
1989 300E with 289,000 miles (had for <1 yr while in HI)
03 CLK 500 cabrio (Mom's)
2006 C230k (Dad's)
1999 S420 (Mom's/Dad's)
2000 C230k Sport sedans
2001 CLK320 Cabrio (Mom's)
1995 C280 My First Mercedes-Benz... (155k miles. EXCEPTIONAL AUTOMOBILE. Was Very hard to let go of!)