229.5 Vs 229.51 oil?

Rich20

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I have a 2006 euro 4 e220 CDI with no dpf, the original owner was putting the 229.51 oil in, am I better putting the 229.5 oil in instead as I've heard it has better wear protection
 

rf065

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If no DPF you can use either, that what I've been doing for the last 138,000 miles.

Russ
 

LostKiwi

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In general a diesel oil will have enhanced detergent packages to break down deposits. I use 229.51 in my petrol cars for this reason.
 

Yugguy

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It's 5.2 these days too. I use 5.1 in my none dpf 646.
 

John Laidlaw

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Doesn’t make much difference in your car
 

mercedes13156

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And ASDA are having a "Rollback" sale with a five litre bottle of 51 spec for £18.00. If it meets the spec, it must do the trick.
 

Wighty

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You can get 20L of MB branded 229.51 oil delivered for £54 !! On eBay , you won't find cheaper for the spec . It goes in both my cars
 
OP
R

Rich20

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I can get the mb 229.51 oil from mercedes teeside for £56 so think I'm going to go with that. Who produces the factory oil for mercedes
 

LostKiwi

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As I understand it the 229.51 is a low SAPS (SAP is Sulphur, Ash and Potassium) oil designed for vehicles with DPFs (diesels). SAPS is the additive package used to reduce wear in engines but as it contains some compounds harmful to DPFs it cannot be used in high concentrations. Accordingly the 229.51 oils have a higher detergent content (used to dissolve deposits found inside the engine) and an anti wear package consisting of a different set of compounds, mainly ZPPD (zinc diallkyldithiophosphate), Calcium Suphonate and sometimes Molybdenum Disulphide (MoS2).
ZPPD in high concentrations can be harmful to catalytic convertors but in 229.51 oils the concentration is at a level that isn't harmful. There are retail packs of ZPPD additives available under various trade names.
SAPS were used predominently as they were cheap (the sulphur compounds were waste products) and highly effective thus allowing the use of lower quality basestock oils. Low ash oils tend to use higher quality basestock oils to enable the relevant protection to be maintained.
So what does it mean?
It means the additive package may be slightly less effective but that the oil basestock may be better quality to offset it. In reality the effect on an engine will be negligible between the two as long as they are approved by the manufacturer.
 

AMGeed

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