What Oil Do You Use for Diesel Engines?

[buzz]

Hi all

Read your post with interest.
Earlier in this thread it was mentioned how do you judge the oil.
My previous dealer uses Nissan 15-50 which we believe is a valvoline sourced product for the 3 lt and the mighty 4.2td in mine.
Now that I have moved north, I have been changing oil and filters myself using Penrite 15-50 and genuine filters. Spill heaps when removing filters from top.
How and where do do test the oil
cheers

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