So we came to an agreement that i can keep both the E320 and the 300SD (300SD is my back up car), Now to my question is there anything that i need to know or do when i am keep my 300SD that is no longer going be my daily driver....What about the fuel?? Should i add some additive to prevent alge to grow if so what is the additive called, cover the exhaust pipe?? I am going to start up drive every twice a week....

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Current Garage
2008 Mercedes GL320 CDI 188k mi Repair/Work in progress
1994 S350 160k mi Garage Queen & prepping for repairs
2005 E320 CDI 203k mi Healthy & Daily Driver
1994 S350 357k mi Retried as parts car
1984 300TD 214k mi Blown OM617 Poss OM603 Swap??

Sold
1987 300SDL 200K+
1994 S320 181K mi
2008 E320 Bluetec 127k mi
1999 S420 130K mi
1980 240D 360k mi
15+ Others that has come, stay and gone

GONE, BUT NOT FORGOTTEN
1995 E320 SE 220k mi
1984 300SD 350k mi