In Autralia, a LS1 performance workshop is recommending Castrol Edge 25W50 and it is a SG rated oil. Is this rating too outdated, or is there some merit in using it eg. additive levels and so on.
Would you use SG rated oil in a LS1 ?
- Thread starter vxcalais
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I don't know any thing about Castrol Edge or the oils you have in down under, but if it were here, I would not use it. I also would not use 20W-50 in a LS1, but that's just me.
Isn't SG from the mid-eighties or so? Is the oil new or has it been sitting around that long?
No its a new oil. Been around for about 5 years now. Some performance workshops recommending it, but i dont understand why you would wanna use a SG rated oil in a new car ? Did SG have unique additive levels etc ?
Originally Posted By: vxcalais
In Autralia, a LS1 performance workshop is recommending Castrol Edge 25W50 and it is a SG rated oil. Is this rating too outdated, or is there some merit in using it eg. additive levels and so on.
If workshop have modified your engine in any way, I would ask them for specific reasons for their recommendation.
If that's not the case, then I would use oil based on OEM recommendations.
In Autralia, a LS1 performance workshop is recommending Castrol Edge 25W50 and it is a SG rated oil. Is this rating too outdated, or is there some merit in using it eg. additive levels and so on.
If workshop have modified your engine in any way, I would ask them for specific reasons for their recommendation.
If that's not the case, then I would use oil based on OEM recommendations.
http://www.castroledge.com.au/downloads/variant_factory_EDGE_25w50.pdf
Castrol Edge 25W50 is now an SM rated oil. Is there any reason not to just use this SG stuff in a lawn mower and buy new SM graded oil?
Castrol Edge 25W50 is now an SM rated oil. Is there any reason not to just use this SG stuff in a lawn mower and buy new SM graded oil?
Patman
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Yep, unless the engine has been rebuilt using much larger clearances, I would stick with a 30 weight oil.
If you're doing a lot of road racing with sustained high oil temps (250F plus) then I'd bump that up to a 40 weight, but no more than that. The real solution would be to get a good oil cooler, keep the oil temps below 250F, and run a 30 weight oil though. The big problem with the 20w50 oil is that the viscosity is just far too thick on initial startup, plus you're robbing yourself of about 5hp compared to the 30 weight oils too. And you'd lose a lot of low end torque also, making the engine feel too sluggish.
My LS1 loves Pennzoil Platinum 5w30!
If you're doing a lot of road racing with sustained high oil temps (250F plus) then I'd bump that up to a 40 weight, but no more than that. The real solution would be to get a good oil cooler, keep the oil temps below 250F, and run a 30 weight oil though. The big problem with the 20w50 oil is that the viscosity is just far too thick on initial startup, plus you're robbing yourself of about 5hp compared to the 30 weight oils too. And you'd lose a lot of low end torque also, making the engine feel too sluggish.
My LS1 loves Pennzoil Platinum 5w30!
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