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Old 01-04-2019, 09:08 AM   #1 (permalink)
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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

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

US MPG for my Merc s124 300TD

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