SL55 AMG, SL63 AMG, SL65 AMG (R230) 2002 - 2011 (2003 US for SL55 and 2004 for the SL65)

SL55/63/65/R230 AMG: M156 Intake manifold R&R...what else should be replaced?

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Old Jan 2, 2025 | 06:51 PM
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2009 SL63, 1999 E300 (462k miles and counting)
M156 Intake manifold R&R...what else should be replaced?

Getting ready to do an R&R on the intake manifold. Car has 100k miles on it. Wondering what else should be done while I'm in there.

PCV?
What else?
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Old Jan 2, 2025 | 09:45 PM
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The IM gaskets and bolts (1-time use).

Fuel injectors (40-50K mile item on the M156).

Install a catch can if you don't have one already.

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Old Jan 3, 2025 | 12:25 AM
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2009 SL63, 1999 E300 (462k miles and counting)
thanks @HLG600 I see 63 and weistec make them. Are there others?
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Old Jan 3, 2025 | 02:42 PM
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Originally Posted by stereophile33
thanks @HLG600 I see 63 and weistec make them. Are there others?
VRP sells a kit, but it looks to be a PLM-made one.

If taking that route, you can save yourself $150 and order direct from PLM since it's currently on sale: https://privatelabelmfg.com/products...atch-can-combo

PLM also sells their M156-specific fittings separately, allowing you to use any catch can you'd like: https://privatelabelmfg.com/products...pr_seq=uniform

I have the Weistec catch can. Pricey, but it was the only one on the market at the time of purchase and has served me well over the last 5+ years.

Currently is back-ordered 12+ weeks, however.

Have no direct experience with the 63 Motorsports catch can, but I do know that they are a reputable company.

If I bought a second M156 car and was shopping for a catch can today, I'd either give 63 Motorsports a try or use the PLM fittings with a high-quality catch can like one from Radium Engineering.

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Old Jan 6, 2025 | 12:27 PM
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2009 SL63, 1999 E300 (462k miles and counting)
Originally Posted by HLG600
VRP sells a kit, but it looks to be a PLM-made one.

If taking that route, you can save yourself $150 and order direct from PLM since it's currently on sale: https://privatelabelmfg.com/products...atch-can-combo

PLM also sells their M156-specific fittings separately, allowing you to use any catch can you'd like: https://privatelabelmfg.com/products...pr_seq=uniform

I have the Weistec catch can. Pricey, but it was the only one on the market at the time of purchase and has served me well over the last 5+ years.

Currently is back-ordered 12+ weeks, however.

Have no direct experience with the 63 Motorsports catch can, but I do know that they are a reputable company.

If I bought a second M156 car and was shopping for a catch can today, I'd either give 63 Motorsports a try or use the PLM fittings with a high-quality catch can like one from Radium Engineering.
ordered the PLM and Radium kits. Excited to get those in.
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Old Jan 6, 2025 | 04:17 PM
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Originally Posted by stereophile33
ordered the PLM and Radium kits. Excited to get those in.
Nice. Don't be alarmed if you find some oil pooled in the IM when doing the R&R.

This is normal, easy to clean up (many use gasoline) and the catch can should prevent it moving forward.

Something to note, the typical M156 mounting locations might not be ideal in the engine bay of an R230 since you have the SBC unit and ABC reservoir to navigate around.

Here are photos of how I and another forum member installed the Weistec catch can: https://mbworld.org/forums/sl55-amg-...-location.html

The Weistec unit is admittedly pretty large / bulky, so you might have more flexibility with a Radium catch can.

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Old Jan 13, 2025 | 11:42 AM
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2009 SL63, 1999 E300 (462k miles and counting)
Originally Posted by HLG600
Nice. Don't be alarmed if you find some oil pooled in the IM when doing the R&R.

This is normal, easy to clean up (many use gasoline) and the catch can should prevent it moving forward.

Something to note, the typical M156 mounting locations might not be ideal in the engine bay of an R230 since you have the SBC unit and ABC reservoir to navigate around.

Here are photos of how I and another forum member installed the Weistec catch can: https://mbworld.org/forums/sl55-amg-...-location.html

The Weistec unit is admittedly pretty large / bulky, so you might have more flexibility with a Radium catch can.

Thanks, I'll being doing in the next couple of weekends, thanks for your suggestions and I'll report back on all the topside work.
  • New Intake Manifold
  • PCV
  • Catch Can
  • Spark Plugs
  • Coils
  • ROW Airboxes
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Old Jan 14, 2025 | 11:57 AM
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I'm not sure on the M156, but on the M113K engine the intake manifold had to be removed to access the MAP sensor. In the event the M156 does have a MAP sensor at the rear of the engine, I would replace that as well, of course using genuine Bosch part.
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Old Jan 14, 2025 | 03:53 PM
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Originally Posted by stereophile33
Thanks, I'll being doing in the next couple of weekends, thanks for your suggestions and I'll report back on all the topside work.
  • New Intake Manifold
  • PCV
  • Catch Can
  • Spark Plugs
  • Coils
  • ROW Airboxes
Anytime!

Nice preventive maintenance list there.

Were the fuel injectors replaced recently? Pardon my persistence, but they carry a big risk in the M156 platform (many cases of them failing and hydro-locking the engine)...and also happen to be an inexpensive and easy "while you're in there" item.

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