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castrol 5w30 c3 for an LS? #5327483 01/19/20 11:32 PM
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neo3 Offline OP
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I am deciding what to use in my freshly rebuilt 20 year old LS1. The Castrol 5W30 C3 has a good list of standards, but it's supposedly meant for diesels. I can't find a 5W30 with better "specs" on paper, except maybe Mobil 1 ESP (is that right?) which only comes in quarts so it's ridiculously expensive. Plus Walmart carries it. I don't want to use an Xw40, since that's what I was using before the rebuild and it's slightly possible that could be the cause of some cylinder wear it had (there's no other likely explanation), and also the original owner's manual specifically says not to use a 40 weight. So looking for opinions on whether the Castrol C3 would be a good choice.

Re: castrol 5w30 c3 for an LS? [Re: neo3] #5327520 01/20/20 04:41 AM
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Sveina Offline
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Why not look into some Lubrication Engineers Monolec 5w30?


Current: '07 MB E320 CDI 4matic, '06 MB S550, '02 Porsche 996 twinturbo, '01 Dodge Viper GTS 8,1, '03 Peugeot 206 RC (race), '03 Peugeot 206 GTI
Re: castrol 5w30 c3 for an LS? [Re: neo3] #5327523 01/20/20 04:44 AM
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skyactiv Offline
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Being that its rated for VW 502, that oil should work just fine for your LS1. I'm thinking the cause for upper cylinder wear you saw
has something due to the air filtration system. Dirty air made its way into the engine somehow at some point.


Wife: 15' Audi A4 quattro 6 speed manual
Me: 18' Elantra Sport 6 speed manual
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Re: castrol 5w30 c3 for an LS? [Re: neo3] #5327634 01/20/20 08:43 AM
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2013 Toyota Avalon Hybrid TGMO 0W20, 81k
1993 Volvo 245 T5 10W30, 168k
1993 Volvo 244 T5 10W30, 177k

Re: castrol 5w30 c3 for an LS? [Re: neo3] #5327670 01/20/20 09:25 AM
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SubieRubyRoo Offline
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Originally Posted by neo3
I don't want to use an Xw40, since that's what I was using before the rebuild and it's slightly possible that could be the cause of some cylinder wear it had (there's no other likely explanation), and also the original owner's manual specifically says not to use a 40 weight.


You can choose not to use a 40wt, that's fine, but your engine doesn't know if it's got a 40 wt in it, unless you are trying to start it in Alaska in January. In Tucson, where the average low in the "winter" months is +40*F, you could use it year round without issue. I agree with skyactiv, dirt ingress is a much more likely culprit for cylinder wear than oil weight ever would be. But, oil choice is an extremely emotionally charged issue, so use what makes you feel warm and fuzzy. Any SN/SN+ oil on the shelves at Walmart will provide sufficient protection for an LS engine, unless you had it built with a stroker, and different clearances, and yada yada... you get the drift. I'd go to the section of shelving with the synthetics on it, pick whatever color or price tickled my fancy in 5W30, and go with that. But that's me.


De omnibus dubitandum.
Re: castrol 5w30 c3 for an LS? [Re: neo3] #5327674 01/20/20 09:30 AM
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kschachn Offline
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Originally Posted by neo3
I am deciding what to use in my freshly rebuilt 20 year old LS1. The Castrol 5W30 C3 has a good list of standards, but it's supposedly meant for diesels. I can't find a 5W30 with better "specs" on paper, except maybe Mobil 1 ESP (is that right?) which only comes in quarts so it's ridiculously expensive. Plus Walmart carries it. I don't want to use an Xw40, since that's what I was using before the rebuild and it's slightly possible that could be the cause of some cylinder wear it had (there's no other likely explanation), and also the original owner's manual specifically says not to use a 40 weight. So looking for opinions on whether the Castrol C3 would be a good choice.

Can you post that language from the owner's manual? Or maybe a picture of the page.


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Re: castrol 5w30 c3 for an LS? [Re: neo3] #5327687 01/20/20 09:40 AM
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edyvw Offline
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Originally Posted by neo3
I am deciding what to use in my freshly rebuilt 20 year old LS1. The Castrol 5W30 C3 has a good list of standards, but it's supposedly meant for diesels. I can't find a 5W30 with better "specs" on paper, except maybe Mobil 1 ESP (is that right?) which only comes in quarts so it's ridiculously expensive. Plus Walmart carries it. I don't want to use an Xw40, since that's what I was using before the rebuild and it's slightly possible that could be the cause of some cylinder wear it had (there's no other likely explanation), and also the original owner's manual specifically says not to use a 40 weight. So looking for opinions on whether the Castrol C3 would be a good choice.


It is not diesel oil, it is Lower-SAPS oil. In Europe gasoline engines use C3 oils since 2009. US could not since gas had higher sulfur levels, but that is not the case.
That being said, ultimate Castrol oil is this:
Castrol Edge 0W30


11' BMW 328i xDrive 6MT (BMW TPT 5W30+OE filter)
11' VW Tiguan 2.0T (Castrol 0W30+OE filter)
15' Toyota Sienna AWD (Mobil1 5W30 EP+OEM filter).
Re: castrol 5w30 c3 for an LS? [Re: kschachn] #5327698 01/20/20 09:56 AM
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neo3 Offline OP
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Originally Posted by kschachn

Can you post that language from the owner's manual? Or maybe a picture of the page.


Well my recollection of that was faulty, it actually says "Do not use other viscosity oils, such as SAE 20W-50". It says 10W30 is OK for temps over 0 F, but "SAE 5W30 is best for your vehicle". Of course this is all based on oil technology from 20 years ago.

Re: castrol 5w30 c3 for an LS? [Re: neo3] #5327708 01/20/20 10:12 AM
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Geoff Offline
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Dexos2 and/or ACEA A3 works well in my experience on/off the track with an LS3. Low SAPs nice for cleaner exhaust.


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Re: castrol 5w30 c3 for an LS? [Re: neo3] #5327735 01/20/20 10:40 AM
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edyvw Offline
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Originally Posted by neo3
Originally Posted by kschachn

Can you post that language from the owner's manual? Or maybe a picture of the page.


Well my recollection of that was faulty, it actually says "Do not use other viscosity oils, such as SAE 20W-50". It says 10W30 is OK for temps over 0 F, but "SAE 5W30 is best for your vehicle". Of course this is all based on oil technology from 20 years ago.


C3 would be heavy W30 oils. What GM had in mind is thinner 5W30 oils.
Still, there is no problem using heavy W30 (ACEA A3 or C3) or thinner W40 (usually all ACEA A3 and C3 W40 oils are on thinner side, max. 14.2cst).
However, it is not only thickness. Oils carrying European approvals have lower NOACK, theya re stay in grade, more stringent oxidation and deposit requirements.


11' BMW 328i xDrive 6MT (BMW TPT 5W30+OE filter)
11' VW Tiguan 2.0T (Castrol 0W30+OE filter)
15' Toyota Sienna AWD (Mobil1 5W30 EP+OEM filter).
Re: castrol 5w30 c3 for an LS? [Re: neo3] #5328300 01/20/20 09:09 PM
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neo3 Offline OP
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Also related to this, I noticed (on walmart.com) that Castrol actually has two different 5W30 C3 versions, they're both called "Advanced Full Synthetic", in a black bottle, both say Dexos 2, but the graphics are different, and one says "Fluid Titanium Technology", the other says "Strength for Maximum Perfornance" (no mention of titanium). They're the exact same price. Which is "better"?



Last edited by neo3; 01/20/20 09:12 PM.
Re: castrol 5w30 c3 for an LS? [Re: neo3] #5328305 01/20/20 09:16 PM
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Whichever one gives you a warm tingly feeling over a larger portion of your body. If that warm tingly feeling is because you've consumed some of said product, you should call Poison Control immediately.

No offense, but it seems you've already made up your mind and are just looking for confirmation. Since you're ignoring every piece of advice given so far, it looks like you may want to just pull straws to solidify your pick. Sorry.


De omnibus dubitandum.
Re: castrol 5w30 c3 for an LS? [Re: SubieRubyRoo] #5328344 01/20/20 10:06 PM
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neo3 Offline OP
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Originally Posted by SubieRubyRoo
Whichever one gives you a warm tingly feeling over a larger portion of your body. If that warm tingly feeling is because you've consumed some of said product, you should call Poison Control immediately.

No offense, but it seems you've already made up your mind and are just looking for confirmation. Since you're ignoring every piece of advice given so far, it looks like you may want to just pull straws to solidify your pick. Sorry.


Huh? I asked a simple question about the difference between versions of the same product. And which advice did I "ignore"? If you have no useful info to contribute, why did you reply?

Re: castrol 5w30 c3 for an LS? [Re: neo3] #5328362 01/20/20 10:45 PM
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edyvw Offline
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Originally Posted by neo3
Originally Posted by SubieRubyRoo
Whichever one gives you a warm tingly feeling over a larger portion of your body. If that warm tingly feeling is because you've consumed some of said product, you should call Poison Control immediately.

No offense, but it seems you've already made up your mind and are just looking for confirmation. Since you're ignoring every piece of advice given so far, it looks like you may want to just pull straws to solidify your pick. Sorry.


Huh? I asked a simple question about the difference between versions of the same product. And which advice did I "ignore"? If you have no useful info to contribute, why did you reply?

Again, go with Castrol 0W30.


11' BMW 328i xDrive 6MT (BMW TPT 5W30+OE filter)
11' VW Tiguan 2.0T (Castrol 0W30+OE filter)
15' Toyota Sienna AWD (Mobil1 5W30 EP+OEM filter).
Re: castrol 5w30 c3 for an LS? [Re: neo3] #5328415 01/21/20 02:22 AM
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zeng Offline
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Originally Posted by neo3
Also related to this, I noticed (on walmart.com) that Castrol actually has two different 5W30 C3 versions, they're both called "Advanced Full Synthetic", in a black bottle, both say Dexos 2, but the graphics are different, and one says "Fluid Titanium Technology", the other says "Strength for Maximum Perfornance" (no mention of titanium). They're the exact same price. Which is "better"?



Pick FST for its Titanium content that provides friction reduction and film strength .

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