Oil wt for summer driven LS1?

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377
Location
Ontario,Canada.
Hey guys, I have an LS1 powered f body that gets driven only in the summer months and was wondering if I should finally steer away from GC and move to something else? There is no real reason that I am debating on moving from GC, just wanted to try and see if there is something different out there. I know that the LS1's enjoy the thicker oils. Would a 5W40 be something to look at?
 
Messages
55
Location
NJ
I would say if your car likes GC, you can try going with M1 0w-40. I usually recommend GC to people who like M1 0w-40 though FYI. M1 HM 5w-30 is also a solid choice. If you want 5w40, go with Rotella T6, it is loaded with goodies. This also depends on your OCI. How often do you change your oil?
 
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4,009
Location
Calgary Canada
Patman who is a moderator on this site has a Corvette with the LS1 IIRC and his GC summer/winter UOAs are excellent. I see no reason to steer away. On the other hand, Esso and Petro Canada make some nice 0w-30 and 0w-40 HDEOs that can be had for around 60% of the retail price of M1 and GC. If I had your trans am, those would be good candidates for replacing GC while knowing you are getting a first rate oil.
 
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10,146
Location
Burlington, Ontario, Canada
You can look at a 5W-40 but don't run it in you TA. If you don't track your car you don't need anything heavier than a typical 5W-30 like M1, PP or PU. GC while a fine oil is even heavier than necessary for a LS1.
 
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9,614
Location
Pennsylbammyvania
Any of the current, top grade 0W-40s (Mobil 1, Red Line, Amsoil, etc.) would be PLENTY thick enough for our powerplants. I've tried both Red Line and Amsoil 5W-40s, and personally found them to be a little too thick (even in the dead of a hotter summer than you will ever see) for these engines (stock/unbuilt bottom end clearances at least). wink As MANY on here will tell you, the 0W-xxes help keep wear and tear to a minimum on startup, even if it is 105*F outside, due to their higher viscosity indexes.
 

Patman

Staff member
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22,012
Location
Guelph, Ontario
Originally Posted By: Jim 5
Patman who is a moderator on this site has a Corvette with the LS1 IIRC and his GC summer/winter UOAs are excellent. I see no reason to steer away.
Actually, I haven't run GC in my Corvette since 2007. After that I ran 6 intervals with Pennzoil Platinum 5w30 and I'm on my third interval with Ultra 5w30 right now. All three oils performed very similar in my UOAs, so I think the LS1 does well on quite a few different oils and it doesn't need to be that thick of an oil either (unless you plan on doing a lot of track driving)
 
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9,614
Location
Pennsylbammyvania
Originally Posted By: CATERHAM
If you don't track your car you don't need anything heavier than a typical 5W-30 like M1, PP or PU.
^^^In north Ontar I OH (as Gordie says in the song "Cabaret" wink ) at least.
 
Messages
10,146
Location
Burlington, Ontario, Canada
Originally Posted By: Jim 5
Patman who is a moderator on this site has a Corvette with the LS1 IIRC and his GC summer/winter UOAs are excellent. I see no reason to steer away. On the other hand, Esso and Petro Canada make some nice 0w-30 and 0w-40 HDEOs that can be had for around 60% of the retail price of M1 and GC. If I had your trans am, those would be good candidates for replacing GC while knowing you are getting a first rate oil.
Patman has been running PP and most recently PU 5W-30 in his Vette for the past couple of years. Thanks for bringing up PC. Their Supreme 0W-30 is also a good choice meeting all the current GM dexos spec's and with a HTHSV of 3.2cP is somewhat heavier than the 5W-30's I've mentioned plus it has a higher 177 VI making it a much better winter choice to GC (VI 167).
 
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1,271
Location
Dallas Texas
IIRC, the Vette says M1 5W-30 on the cap. You could probably run that even on light track days. Its got a HUGE sump too! Bob Bondurant uses M1 15W-50 in their C4 corvettes, and M1 5W-30 in the newer ones when they flog it. Something to do with an oil cooler. I would seek a 1991-1995 ZR1 405HP engine. Maybe put M1 15W-50 in that, as the Arizona performance driving school does. EDIT: I see you are talking about the T/A WS6. Tell me, how does that thing run? Times, feel, handling, power, Any mods? How is it! Thats "The Corvette motor" for sure!
 
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9,614
Location
Pennsylbammyvania
Originally Posted By: buster
The oil it comes with. M1 5w30.
The f body LS1s never came with Mobil 1 as a factory fill. Yes, the C5 Vettes did, and yes it was the same EXACT engine (save for the lack of an EGR system, better exhaust manifolds/system, and sump capacity), so you are at least partially correct on it being a factory fill. wink
 
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34,378
Location
NJ
Originally Posted By: dailydriver
Originally Posted By: buster
The oil it comes with. M1 5w30.
The f body LS1s never came with Mobil 1 as a factory fill. Yes, the C5 Vettes did, and yes it was the same EXACT engine (save for the lack of an EGR system, better exhaust manifolds/system, and sump capacity), so you are at least partially correct on it being a factory fill. wink
Oh ok, thanks for correcting me. You can use any oil meeting the GM 4718M spec. PP/PU would be good too.
 
Messages
1,271
Location
Dallas Texas
Originally Posted By: CATERHAM
You can stick with GC, but most of us are saying any lighter 5W-30 syn' would also be more than fine.
Basically +1 GC would be good for tracking the car heavily?
 
Messages
1,460
Location
Las Vegas
Originally Posted By: buster
Originally Posted By: dailydriver
[quote=buster]The oil it comes with. M1 5w30.
The f body LS1s never came with Mobil 1 as a factory fill. Yes, the C5 Vettes did, and yes it was the same EXACT engine (save for the lack of an EGR system, better exhaust manifolds/system, and sump capacity), so you are at least partially correct on it being a factory fill. wink
You might want to double check your sources. LS1 Camaros and Firebirds did come with M1 5W-30 as the FF in the last couple of years, according to Scott Settlemire, one of the GM F-body leads. I'm not sure about the earlier years.
 
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