A5/B5 0w30 oil brands

[Leyburn]

@ skyship007

The biggest difference with the Amsoil 25k oil is the guarantee, although not in the UK or for cars over 100k miles, but it demonstrates confidence in the product.

For engines with fine tolerances between moving parts, higher viscosity oils can lead to galling. Straight 50 oil isn't a problem with a 60 year old British single motorcycle, one reason being the large tolerances between moving parts (also 1k oil change intervals). The same oil in a D5 engine would be catastrophic. If my D5 starts burning 0w30 then I'll consider switching to a higher viscosity oil.

Assuming that UAO = oil analysis, it's unlikely that anyone is going to do that routinely for a D5.

A key component for 25k oil changes is use. Castrol claim a scarcely believable 18000 engine starts per year for the "normal" driver http://www.castrol.com/en_gb/united-...art-index.html . I doubt if I start my D5 more than 1000 times a year, a typical journey being 2 miles country roads, 80 miles motorway, 2 miles (or less) urban. Reverse journey at the end of the working day.

I would be interested to find out if the DPF on my D5 has positively re-generated in my ownership, I've never been aware of it, the oil level has never moved up the dipstick. If I ever need VIDA then this will be something I can check. My previous VAG vehicle was equipped with a DPF warning light, never illuminated in 130k+ miles

in bullet points, what are the key differences between A5/B5 and A3/B4.

Do you work in the oil sector?