nothing really wrong with the engine.. just the 4matic system. and the car is a pig.. like 15mpg in the city, 18 hwy.

I'm brewing WVO for straight use in a diesel, so the fuel savings will pay for the swap in a year. (I drive about 40k a year)
40k/18 mpg = 2222.22 gals fuel
2222 gals fuel x $3.15= $7000
WVO bioprocessed myself
40k/25mpg = 1600 gals
1600 x $1.25 = $2000

that's a pretty substantial yearly savings, and the biofuel doesn't cost nearly as much as I listed.

for some reason the value on these cars isn't all that great- the going rate seems to be about 2500, and with the 4matic not working, even less.

even so, the car is paid for. I really don't care about resale, just mileage, and saving fuel money.