"OF COURSE IT DOES!" would be the common answer. Automakers and their engineers knows everything about an engine, and they know better than anybody wich kind of oil fits better. That's right, isn't it?
OK. Let me propose an example. I have a van, a Fiat Ducato with a great 2.3 SOFIM Engine (shared with Iveco Daily). I take the Bible, I mean, the owner's book, and Selenia WR 5W40 (from Petronas) is prescribed. Ok, I know, that's only a marketing policy, there're contracts inked and blablabla. They recomend Petronas as they could do with Shell, Motul, Elf or any other. SFSG. But, I can asume that this oil, from Petronas' portfolio, is the best for my engine. That's right? If I want to choose another brand, I should search for an oil the nearest as possible to Selenia WR and, in any case, a 5W40.
If we have a look to Selenia WR's properties:
Viscosity at 100ºC: 15cSt. So, it's a very thick xW40, almost a xW50.
OK, I have to trust in God's and automaker's word.
But, if I take the owner's book of a DPF Ducato, exactly the same engine, for the first to the last bolt, Selenia WR PE 5W30 is prescribed. And thar oil has...
Viscosity at 100ºC: 10.2cSt. It's a very thin xW30, almost a xW20.
[censored]????
What's the most suitable viscosity for taking care of my engine, 10cSt environ or 15cSt environ? Both can't be correct. I know, any of them is not going to cause heavy damage in my engine, but I was following automaker's prescription in order to achieve the better result. If not, I'd demand my neighbour's oppinion!!!
And taking care of the DPF it's not a reason, because there are plenty of 5W40 that fulfill ACEA C3.
Yes, engineers knows almost everything about engines they design... but engineers don't rule the world (Goldman Sachs rule the world ).
Sorry for my poor English. I hope it'll be at least understandable.
Greetings from the rainy side of Spain!
OK. Let me propose an example. I have a van, a Fiat Ducato with a great 2.3 SOFIM Engine (shared with Iveco Daily). I take the Bible, I mean, the owner's book, and Selenia WR 5W40 (from Petronas) is prescribed. Ok, I know, that's only a marketing policy, there're contracts inked and blablabla. They recomend Petronas as they could do with Shell, Motul, Elf or any other. SFSG. But, I can asume that this oil, from Petronas' portfolio, is the best for my engine. That's right? If I want to choose another brand, I should search for an oil the nearest as possible to Selenia WR and, in any case, a 5W40.
If we have a look to Selenia WR's properties:
Viscosity at 100ºC: 15cSt. So, it's a very thick xW40, almost a xW50.
OK, I have to trust in God's and automaker's word.
But, if I take the owner's book of a DPF Ducato, exactly the same engine, for the first to the last bolt, Selenia WR PE 5W30 is prescribed. And thar oil has...
Viscosity at 100ºC: 10.2cSt. It's a very thin xW30, almost a xW20.
[censored]????
What's the most suitable viscosity for taking care of my engine, 10cSt environ or 15cSt environ? Both can't be correct. I know, any of them is not going to cause heavy damage in my engine, but I was following automaker's prescription in order to achieve the better result. If not, I'd demand my neighbour's oppinion!!!
And taking care of the DPF it's not a reason, because there are plenty of 5W40 that fulfill ACEA C3.
Yes, engineers knows almost everything about engines they design... but engineers don't rule the world (Goldman Sachs rule the world ).
Sorry for my poor English. I hope it'll be at least understandable.
Greetings from the rainy side of Spain!