Quote:
Originally Posted by Clan
volvo have never recommended 5w/40
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They did (see below) but even if they didnt its still ok to use a better wearresistant oil with common sense
Also the valvelifters will be thankfull ;-)
Well there are differences between manuals in countries
But lets say we take a pre 2005 manual
https://www.volvoclub.org.uk/webmanu..._EN_tp6678.pdf
On page 156 we get the recommendation to use a acea b4 spec oil on DIESEL engines
Quote:
Originally Posted by 5cilinder
Diesel engines : acea B4
Note that the same oil can comply with ACEA
A3, ACEA B3 and ACEA B4, regardless of
whether the oil is a mineral oil, semi-synthetic
or fully synthetic
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You do know that the wateroils dont/cant meet this wearspec? and almost all synthetic and even some semisynthetic 5w40 do meet this spec? 5w40 isn excluded its almost mandatory to meet this b4 spec
Why is that? and why is this changed to a lesser wearspec after 2005? the answer i gave 2 posts earlier
Also the argumentation that 0w30 is longlife makes it even worse, the polymers that are used to make the 30 part after the W are being chopped up by mechanical stresses during (longer)usage and will lessen the viscosity even more on high temps, there are also plenty longlife 5w40 oils