Fuel Economy, Hypermiling, EcoModding News and Forum - EcoModder.com - View Single Post - Improving Mercedes OM603 engine efficiency

320touring · 01-04-2019, 10:08 AM

Hi All,

Back after a long time away, I now have a Mercedes s124 with the 3.0 6cyl 12v OM603 engine.

It's normally aspirated, so no turbo to benefit from.

The car is heavy at 3500lbs, and has 113bhp coupled to a 4speed auto.

I am also running it on Veg oil (SVO/filtered WVO) At up to 90% oil. The car has been run on this for years by previous owners, and seems happy enough.

The engine definitely is not in its first flush of youth (316k miles), and I've ordered

Oil/oil filter
Air filter
Main fuel filter
Pre fuel filter
Thermostat

To give it a service.

My initial plan is to carry out the service, and check the fluid levels in the autobox and diff, but I was wondering if there were any other elements that should be checked on the engine (pump/fuel system/inlet/valvetrain etc)?

Additionally, I think some more power would assist re economy - it feels as if you are ALWAYS accelerating!

Does anyone know what can be done to boost performance/restore to at least original?

01-04-2019, 10:08 AM	#1 (permalink)
320touring Master EcoModder Join Date: Jun 2010 Location: scotland Posts: 1,434 The Mistress - '88 Bmw 320i Touring SE Team m8 Last 3: 27.17 mpg (US) Germany Beadle - '91 Mercedes 300td (estate, N/A) 90 day: 24.63 mpg (US) The Bloodylingo - '05 Citroen Berlingo Multispace Desire 90 day: 39.77 mpg (US) Shanner Scaab - '03 Saab 9-5 estate Vector 90 day: 26.19 mpg (US) Clio 182 - '05 Renault Clio RS 182 182 90 day: 31.73 mpg (US) Thanks: 90 Thanked 95 Times in 79 Posts	Improving Mercedes OM603 engine efficiency Hi All, Back after a long time away, I now have a Mercedes s124 with the 3.0 6cyl 12v OM603 engine. It's normally aspirated, so no turbo to benefit from. The car is heavy at 3500lbs, and has 113bhp coupled to a 4speed auto. I am also running it on Veg oil (SVO/filtered WVO) At up to 90% oil. The car has been run on this for years by previous owners, and seems happy enough. The engine definitely is not in its first flush of youth (316k miles), and I've ordered Oil/oil filter Air filter Main fuel filter Pre fuel filter Thermostat To give it a service. My initial plan is to carry out the service, and check the fluid levels in the autobox and diff, but I was wondering if there were any other elements that should be checked on the engine (pump/fuel system/inlet/valvetrain etc)? Additionally, I think some more power would assist re economy - it feels as if you are ALWAYS accelerating! Does anyone know what can be done to boost performance/restore to at least original? __________________ My Blog on cars- Fu'Gutty Cars http://fuguttycars.wordpress.com/ US MPG for my Renault Clio 182 ---------------------------------------------------