Originally Posted By: CATERHAM
Regarding the 10W-30 grade, there is no guarantee that it contains less vanish producing additive than a 0W/5w30 and more often than not, since it is a cheaply made oil it may contain more.
The only advantage of the obsolete 10W-30 grade is that it usually can be picked up very cheaply. And in a hot climate the disadvantages of the grade are largely mitigated.
While I've seen that argued before, the SM/SN GF-4 10w30 still has to pass all the performance tests as the 5w30 EXCEPT cold cranking performance (and consequently VI lost on the low end). This is why I highly doubt any credible oil blender is cheaping out on base stocks vs a 5w30 considering how easy it is to blend a synth 10w30 with even average quality bases with a VI high enough to not worry about adding VMs. This is the appeal for me, no PPDs, no VIIs (synthetic)- or at least the lowest amounts of any modern mineral 30 grade (conventional)
Regarding the 10W-30 grade, there is no guarantee that it contains less vanish producing additive than a 0W/5w30 and more often than not, since it is a cheaply made oil it may contain more.
The only advantage of the obsolete 10W-30 grade is that it usually can be picked up very cheaply. And in a hot climate the disadvantages of the grade are largely mitigated.
While I've seen that argued before, the SM/SN GF-4 10w30 still has to pass all the performance tests as the 5w30 EXCEPT cold cranking performance (and consequently VI lost on the low end). This is why I highly doubt any credible oil blender is cheaping out on base stocks vs a 5w30 considering how easy it is to blend a synth 10w30 with even average quality bases with a VI high enough to not worry about adding VMs. This is the appeal for me, no PPDs, no VIIs (synthetic)- or at least the lowest amounts of any modern mineral 30 grade (conventional)
