Ok thanks.
Here is a little snipit from the Oil Bible website which I found very interesting.
One of my readers found out when he went to buy oil for his (modern 4V common rail diesel) Nissan that they expressly prohibit the use of CG or higher rated oils. Nissan mandate that owners use CF oils in these engines. It's worth noting that the CF spec was already out of date when these engines were built but Nissan did not use the latest API spec because it wasn't good enough!
The fact that API have dropped the CF tests/standard does not in any way improve the later oils that do not meet this standard.
Read more:
http://www.carbibles.com/engineoil_bible.html#ixzz2S8GlOcM9
I have always wonderd if there is any relation between oil used and longativity of the timing chain.
In the book it does stipulate a CF oil. Although if your vehicle has no DPF Penrites primary recomendation is a CI oil. Interesing