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Supertech 25w-40 or Rotella 15-40? #5416748 04/29/20 07:01 PM
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monster1 Offline OP
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I've been running 15w-40 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 15w-40 or switch? I'm running 15w-40 dino currently, but thought if anything, going to Rotella T6 full synthetic. What say you?

Re: Supertech 25w-40 or Rotella 15-40? [Re: monster1] #5416755 04/29/20 07:10 PM
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bullwinkle Offline
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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.


06 Ram 3500 CTD 4X4(FG Venturi), 89 F-450 7.3, 98 XJ 4.0(XG8A), 05 xB(XG3600), 18 Transit 3.7 (MC), 03 Merc Grand Marquis 4.6 2V(XG2), 11 Express 3500 6.0 (Fram PH10060 for now)
Re: Supertech 25w-40 or Rotella 15-40? [Re: bullwinkle] #5416763 04/29/20 07:14 PM
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blufeb95 Online Content
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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]

Re: Supertech 25w-40 or Rotella 15-40? [Re: monster1] #5416767 04/29/20 07:17 PM
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blufeb95 Online Content
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Someone posted a VOA of SuperTech 25w40 about a year ago
VOA - SuperTech 25W40 SynBlend Marine Oil

Re: Supertech 25w-40 or Rotella 15-40? [Re: bullwinkle] #5416938 04/29/20 11:14 PM
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monster1 Offline OP
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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?

Re: Supertech 25w-40 or Rotella 15-40? [Re: blufeb95] #5416943 04/29/20 11:19 PM
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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 15w-40 unless someone tells me otherwise.

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