Penrite has a wide range of products in all kinds of viscosities , but then i saw they have HPR 30 Diesel 20w60, are there any Diesel engine that use this viscosity?? i thought even old Diesls tend to use 15w40 HDEO's or Straight 40.
https://www.penriteoil.com.au/products.php?id_categ=2&id_products=392
https://www.penriteoil.com.au/products.php?id_categ=2&id_products=392