Would someone give me guidance on the best procedure to replace both engine mounts?

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2008 S550
2010 GLK350
1997 E420 (retired)
2005 CLK500 (retired)

use an engine hoist and lift the motor up for some clearance.

Seeing how crowded the engine compartment is I would install them from underneath the car.

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1986 300SDL, 211K,Dealership serviced its whole life
1991 190E 2.6(120k)
1983 300D(300k)
1977 300D(211k)

You can lift the engine from the oil pan ~1/4" - 1/2"; anymore than that and you risk damaging the exhaust connections, fan blade, etc.

It doesnt take too much space to get the old one out; pending how collapsed they are you might need more room to get the new one back in.

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Terry Allison
N. Calif. & Boca Chica, Panama

09' E320 Bluetec 77k (USA)
09' Hyundai Santa Fe Diesel 48k (S.A.)

what support would you use to lift the engine from the oil pan? a 2x4 across the oil pan?

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2008 S550
2010 GLK350
1997 E420 (retired)
2005 CLK500 (retired)

I used a floor jack with a hunk of 2 x 4.

Lift slowly and have a friend help look for anything that might bind.

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Terry Allison
N. Calif. & Boca Chica, Panama

09' E320 Bluetec 77k (USA)
09' Hyundai Santa Fe Diesel 48k (S.A.)

I have a hoist that I use. A cherry picker will work too and an engine cradel will work too.

__________________
1986 300SDL, 211K,Dealership serviced its whole life
1991 190E 2.6(120k)
1983 300D(300k)
1977 300D(211k)