I have an 05 Mercedes 906 (EGR) in a Unimog U500. It calls for Mercedes 228.3 or 228.5 oil; 228.5 preferred. I was using Delvac 5W-40 (228.5) but the Mobil jobber now has only ESP (228.3). ESP is lower on zinc based antiwear ingredients and TBN. So I ordered 55 gal of Delvac SHC, which is 228.5 and has the most zinc based antiwear stuff, a TBN of 16, etc., but is only CF/ACEA E4.
I gather the main issue with EGR is just using a synthetic like Delvac to avoid gumming up the valve; the additives are problems with the converters and particulate filters, which I don't have.
My owners manual says CF is OK and Mercedes' database on operating fluids definitely likes 228.5 the most, so I think I've done the right thing....?
Charlie
I gather the main issue with EGR is just using a synthetic like Delvac to avoid gumming up the valve; the additives are problems with the converters and particulate filters, which I don't have.
My owners manual says CF is OK and Mercedes' database on operating fluids definitely likes 228.5 the most, so I think I've done the right thing....?
Charlie