I've been running 15w40 in my VP 4.3gxi for a few years now. I do one oil change a year as my yearly hours remain low. I noticed Wal-Mart is carrying supertech 25w-40 now which I assume is just rebadged Quicksilver. Should I continue with 15w40 or switch? I'm running 15w40 conventional currently, but thought if anything, going to Rotella T6 full synthetic. What say you?
Supertech 25w-40 or Rotella 15-40?
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T6 has been shown to be somewhat shear prone, and in extended high RPM marine use, that would be a bad thing. I've used Delvac 1300 in the 350 Mag Mercruiser for a few years now, since it carries a CF-2 rating (or at least "recommended for use"), I don't know anything about the ST 25W40-not sure if that would be Warren or not.
Originally Posted by bullwinkle
T6 has been shown to be somewhat shear prone, and in extended high RPM marine use, that would be a bad thing. I've used Delvac 1300 in the 350 Mag Mercruiser for a few years now, since it carries a CF-2 rating (or at least "recommended for use"), I don't know anything about the ST 25W40-not sure if that would be Warren or not.
The FC-W cert says it's made by Warren
![[Linked Image]](https://www.bobistheoilguy.com/forums/attachments/usergals/2020/04/full-87837-44043-25w40.png "[Linked Image]")
T6 has been shown to be somewhat shear prone, and in extended high RPM marine use, that would be a bad thing. I've used Delvac 1300 in the 350 Mag Mercruiser for a few years now, since it carries a CF-2 rating (or at least "recommended for use"), I don't know anything about the ST 25W40-not sure if that would be Warren or not.
The FC-W cert says it's made by Warren
Someone posted a VOA of SuperTech 25w40 about a year ago
VOA - SuperTech 25W40 SynBlend Marine Oil
VOA - SuperTech 25W40 SynBlend Marine Oil
Originally Posted by bullwinkle
T6 has been shown to be somewhat shear prone, and in extended high RPM marine use, that would be a bad thing. I've used Delvac 1300 in the 350 Mag Mercruiser for a few years now, since it carries a CF-2 rating (or at least "recommended for use"), I don't know anything about the ST 25W40-not sure if that would be Warren or not.
Not sure why shear resistant oil is a bad thing. I thought thats one reason why many run HDEO in their marine engines?
T6 has been shown to be somewhat shear prone, and in extended high RPM marine use, that would be a bad thing. I've used Delvac 1300 in the 350 Mag Mercruiser for a few years now, since it carries a CF-2 rating (or at least "recommended for use"), I don't know anything about the ST 25W40-not sure if that would be Warren or not.
Not sure why shear resistant oil is a bad thing. I thought thats one reason why many run HDEO in their marine engines?
Originally Posted by blufeb95
Someone posted a VOA of SuperTech 25w40 about a year ago
VOA - SuperTech 25W40 SynBlend Marine Oil
Thanks. I think I'll stick with the 15w40 unless someone tells me otherwise.
Someone posted a VOA of SuperTech 25w40 about a year ago
VOA - SuperTech 25W40 SynBlend Marine Oil
Thanks. I think I'll stick with the 15w40 unless someone tells me otherwise.
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