I replaced the sagging motor mounts with new cheap ones, and after a few months the ac lines are banging on the frame at idle, and the exhaust hangers keep breaking. I just have to live with the rough idle, but would buying factory motor mounts at least help them last longer?

yes. Click on the 'Buy Parts' Tab or Email Phillip@Peachparts.com

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hum.....
1987 300TD 311,000M Stolen. Presumed destroyed

settle for NOTHING less than lemforder, or O.E. MB Star mounts.
AND replace the shocks at the same time. also, make sure there are no fuel leaks dripping on the rubber, and the metal heat/solvent shields are in place.

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John HAUL AWAY, OR CRUSHED CARS!!! HELP ME keep the cars out of the crusher! A/C Thread
"as I ride with my a/c on... I have fond memories of sweaty oily saturdays and spewing R12 into the air. THANKS for all you do!

My drivers:
1987 190D 2.5Turbo
1987 190D 2.5Turbo
1987 190D 2.5-5SPEED!!!

1987 300TD
1987 300TD
1994GMC 2500 6.5Turbo truck... I had to put the ladder somewhere!

Wasn't there a recent thread on how to make your own since the OE were so expensive? Or is my memory failing me?

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1977 300d 70k--sold 08
1985 300TD 185k+
1984 307d 126k--sold 8/03
1985 409d 65k--sold 06
1984 300SD 315k--daughter's car
1979 300SD 122k--sold 2/11
1999 Fuso FG Expedition Camper
1993 GMC Sierra 6.5 TD 4x4
1982 Bluebird Wanderlodge CAT 3208--Sold 2/13

^^ those were for the engine shock mounts.

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2012 BMW X5 (Beef + Granite suspension model)

1995 E300D - The original humming machine (consumed by Flood 2017)
2000 E320 - The evolution (consumed by flood 2017)

It gets worse Kerry.

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Jim

I've had no engine shocks on mine for years/probably 40k with no issues....Lemfoerdor mounts. But, my engine does run very smoothly...no shaking or anything.

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-diesel is not just a fuel, its a way of life-
'15 GLK250 Bluetec 118k - mine - (OC-123,800)
'17 Metris(VITO!) - 37k - wifes (OC-41k)
'09 Sprinter 3500 Winnebago View - 62k (OC - 67k)
'13 ML350 Bluetec - 95k - dad's (OC-98k)
'01 SL500 - 103k(km) - dad's (OC-110,000km)
'16 E400 4matic Sedan - 148k - Brothers (OC-155k)

Are the Peachparts mounts factory ones? The only time I ever tried to order from peachparts i called a couple of times with no answer, then googled the part number and found the same part (in the factory packaging) for half the price, so I hadn't bothered trying again. I guess I will wait until I can afford to replace the engine shocks too before getting new mounts again. Most of the time my car doesnt idle extremely rough, but it had at least 375k on it when i bought it a year ago(broken odometer), so its obviously a bit worn out.

huh. thats not like phil not to answer... did you leave a message? and I am pretty sure they are OE

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hum.....
1987 300TD 311,000M Stolen. Presumed destroyed

Damn.

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1977 300d 70k--sold 08
1985 300TD 185k+
1984 307d 126k--sold 8/03
1985 409d 65k--sold 06
1984 300SD 315k--daughter's car
1979 300SD 122k--sold 2/11
1999 Fuso FG Expedition Camper
1993 GMC Sierra 6.5 TD 4x4
1982 Bluebird Wanderlodge CAT 3208--Sold 2/13

It just got better. The thread about the homemade urethane shock mounts does in fact include a post by someone who used urethane to strengthen motor mounts:

Cheap engine shock mounts fix

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1977 300d 70k--sold 08
1985 300TD 185k+
1984 307d 126k--sold 8/03
1985 409d 65k--sold 06
1984 300SD 315k--daughter's car
1979 300SD 122k--sold 2/11
1999 Fuso FG Expedition Camper
1993 GMC Sierra 6.5 TD 4x4
1982 Bluebird Wanderlodge CAT 3208--Sold 2/13