With regards to 5w-40 engine oil:
from
http://www.penriteoil.com.au/products.php?id_categ=1&id_subcateg=1&id_products=1
http://www.penriteoil.com.au/pis_pdfs/PI_HPR 5.pdf
"Greater engine protection at operating
temperatures compared to 5W-30 oils due to
higher operating viscosity."
"Semi-synthetic for the latest generation of high performance engines, particularly those with variable valve timing. Use where SAE 5W-30 or 10W-30 oils and ILSAC GF-3/GF-4 fuel economy oils are called for."
(1) I have learnt here that better flow equals better protection, and a lower viscosity oil has better flow.
(2) Why recommend a non-ILSAC engine oil for uses where ILSAC engine oils are specified?
I would say Penrite Oils subscribe to the thicker is better philosophy?
from
http://www.penriteoil.com.au/products.php?id_categ=1&id_subcateg=1&id_products=1
http://www.penriteoil.com.au/pis_pdfs/PI_HPR 5.pdf
"Greater engine protection at operating
temperatures compared to 5W-30 oils due to
higher operating viscosity."
"Semi-synthetic for the latest generation of high performance engines, particularly those with variable valve timing. Use where SAE 5W-30 or 10W-30 oils and ILSAC GF-3/GF-4 fuel economy oils are called for."
(1) I have learnt here that better flow equals better protection, and a lower viscosity oil has better flow.
(2) Why recommend a non-ILSAC engine oil for uses where ILSAC engine oils are specified?
I would say Penrite Oils subscribe to the thicker is better philosophy?