Preferred viscosity for M275?
Thread Starter
Newbie
Joined: Oct 2025
Posts: 7
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From: Sarasota FL
2006 S65
Preferred viscosity for M275?
I did some searching but didn’t find much discussion (I may be doing it wrong…) The maintenance book shows quite a range of acceptable viscosities… from 0W30 to 20W50. Plus from what I can tell this maintenance book is not M275 specific. I initially planned to run a 10W40 but might go thicker since it rarely gets under freezing where the car spends most of its time (FL).
just wondering if anyone has done used oil
analyses on what they are running, and at what intervals & usage. I plan to but it should be a while before I put enough miles on new oil to draw any conclusions.
edit #2: per this link, it looks like only 0W30 to 5W40 are 229.5?
https://operatingfluids.mercedes-benz.com/sheet/229.5/en
Last edited by Beachgoer; Oct 6, 2025 at 08:17 PM.
Super Member
Joined: Dec 2015
Posts: 599
Likes: 237
From: Suburban Maryland
2023 E 450 Sedan. 2018 GLC 300. 2013 E 350 Coupe (retired)
Web search: The M275 engine requires a 5W-40 full-synthetic engine oil that meets Mercedes-Benz's 229.5 approval standard, although a 0W-40 full synthetic may also be used depending on specific model and ambient temperature conditions.
ECS tuning recommends their kit:
Regular engine oil and filter changes are a must for the long life of your Mercedes-Benz engine, and ECS Tuning has made it easy for you to keep your engine oil and filter changed with this oil service kit.
This service kit includes everything you will need to perform an engine oil service on your Mercedes-Benz.
This kit includes the following items:
ECS tuning recommends their kit:
M275 V12 Genuine Oil Service Kit (5w-40)
Includes Genuine filter and Genuine MB 229.5 Spec oilProduct Details
This is an engine oil service kit for your Mercedes-Benz with an M275 V12 engine with a filling capacity of 9 liters.Regular engine oil and filter changes are a must for the long life of your Mercedes-Benz engine, and ECS Tuning has made it easy for you to keep your engine oil and filter changed with this oil service kit.
This service kit includes everything you will need to perform an engine oil service on your Mercedes-Benz.
This kit includes the following items:
- One (1) Engine Oil Drain Plug
- One (1) Engine Oil Drain Plug Washer
- One (1) Engine Oil Filter Kit (Includes Filter And O-Rings)
- Ten (10) Quarts Of Genuine Mercedes-Benz 5W-40 Full-Synthetic Oil
Last edited by smiles201; Oct 7, 2025 at 10:57 PM.
Thread Starter
Newbie
Joined: Oct 2025
Posts: 7
Likes: 0
From: Sarasota FL
2006 S65
Web search: The M275 engine requires a 5W-40 full-synthetic engine oil that meets Mercedes-Benz's 229.5 approval standard, although a 0W-40 full synthetic may also be used depending on specific model and ambient temperature conditions.
ECS tuning recommends their kit:
Regular engine oil and filter changes are a must for the long life of your Mercedes-Benz engine, and ECS Tuning has made it easy for you to keep your engine oil and filter changed with this oil service kit.
This service kit includes everything you will need to perform an engine oil service on your Mercedes-Benz.
This kit includes the following items:
ECS tuning recommends their kit:
M275 V12 Genuine Oil Service Kit (5w-40)
Includes Genuine filter and Genuine MB 229.5 Spec oilProduct Details
This is an engine oil service kit for your Mercedes-Benz with an M275 V12 engine with a filling capacity of 9 liters.Regular engine oil and filter changes are a must for the long life of your Mercedes-Benz engine, and ECS Tuning has made it easy for you to keep your engine oil and filter changed with this oil service kit.
This service kit includes everything you will need to perform an engine oil service on your Mercedes-Benz.
This kit includes the following items:
- One (1) Engine Oil Drain Plug
- One (1) Engine Oil Drain Plug Washer
- One (1) Engine Oil Filter Kit (Includes Filter And O-Rings)
- Ten (10) Quarts Of Genuine Mercedes-Benz 5W-40 Full-Synthetic Oil
BUT, M1 and Pennzoil Platinum Euro do and are readily available locally, already have a Mann filter kit for it, so will just go with that, and keep to 3-5k intervals, with perhaps a UOA since its an inexpensive way to monitor the wear. I was just weirded out by the breadth of visocsity in that non-model specific maintenance book.
Member
Joined: May 2020
Posts: 247
Likes: 57
From: Fort Worth
2005 CL55 AMG || 2005 CL65 AMG || 1989 560SEC
I just go with the liquimoly leichtlauf 5w-40. I tried a bunch of oils in my CL55, and that oil resulted in the quietest valvetrain. That and Ceratec (every 3rd-4th change) is my preferred combo.
Might go ahead and run Liquimoly's engine flush through with the old oil before draining it.
FCPEuro is my go-to. They lifetime warranty everything excluding additives and sprays.
Might go ahead and run Liquimoly's engine flush through with the old oil before draining it.
FCPEuro is my go-to. They lifetime warranty everything excluding additives and sprays.
Thread Starter
Newbie
Joined: Oct 2025
Posts: 7
Likes: 0
From: Sarasota FL
2006 S65
I just go with the liquimoly leichtlauf 5w-40. I tried a bunch of oils in my CL55, and that oil resulted in the quietest valvetrain. That and Ceratec (every 3rd-4th change) is my preferred combo.
Might go ahead and run Liquimoly's engine flush through with the old oil before draining it.
FCPEuro is my go-to. They lifetime warranty everything excluding additives and sprays.
Might go ahead and run Liquimoly's engine flush through with the old oil before draining it.
FCPEuro is my go-to. They lifetime warranty everything excluding additives and sprays.
I’ve got extensive service history on this car so it looks like it’s been maintained well, but have heard of dealerships not using 229.5 oil. After changing the oil I might do a ‘mid-run check’ and replace the filter, inspect the used one, and take a sample for oil analysis just to get an idea of what’s going on-just mostly to satisfy my curiosity.
odds are I won’t continue with that long term, and just opt for annual changes or every 5k miles, whichever comes first since even boutique oil is cheap compared to the alternative.
Senior Member
Joined: Oct 2017
Posts: 368
Likes: 73
SL600
Look here: https://operatingfluids.mercedes-benz.com/sheet/223.2
229.5 Note 2 and Note 5
Note 2: Use only 0W-40 or 5W-40
Note 5: Recommended 0W-40
Some times ago in older variants there was a note AMG 0W-40 only, i guess.
229.5 Note 2 and Note 5
Note 2: Use only 0W-40 or 5W-40
Note 5: Recommended 0W-40
Some times ago in older variants there was a note AMG 0W-40 only, i guess.
