Can i use Mobil-1 0W40 in my LS1?

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i have a 2001 LS1 that has seen Syntec or Mobil-1 10W or 5W30 its' entire 32,000 mile life. Now, I am reading that the M-1 0W40 is a better base oil. My owners' manual reccomends 5W-30. i typically run 10-W because i live in the heat of St. Pete, FL. Can I use the Mobil-1 0W oil in my car, or is it too thin, even though it is a great oil? Oh, I try to change the oil every 5,000 miles (the oil change light). Thanks
 
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I think it will do fine in your engine. At operating temp, it will actually be "thicker" than the oil you've been using. I use Mobil 1 10w30 in my 300M. And if I don't switch to Rotella Syn 5w40 at my next oil change (which I've already done in my van), I'm seriously considering going with the 0w40 Mobil 1.
 
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Can you use it safely :YES I would however venture to guess you will see a nice loss of MPG with the heavier stuff. Why are you considering changing? M1 5w30 is excellent by itself. The OW30 at least from an email i made to Mobil is safe and here was the premise of thier reply. Both Mobil 1 10W30 and 5W30 are in compliance with General Motors "4718M" certification for the factory fill Corvettes. Second as according to Mobil at engine operating temperature thier tech said Mobil 1 0W30 lubrication film thickness is that of 5W30. I do not have the data to corroborate these claims but i respect Mobil's credibility. Food for thought to another proud LS1 Owner-
 
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quote:
Originally posted by outrun: Can you use it safely :YES I would however venture to guess you will see a nice loss of MPG with the heavier stuff.
Maybe not. I've not seen any drop in MPG running Rotella Syn 5w40 versus the Mobil 1 5w30 I used to use.
 
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I haven't looked in my 02 Corvette service manual in a while, but I seem to remember that they were very specific about not using a 40 weight oil of any type. I would need to check again to verify this however. My LS-1 has very high oil pressure with Amsoil 5W-30 and I would expect other oils of the same weight, not sure why you need the heavier oil? Last summer, 100+ degrees, my idle oil pressure was 39 psi.
 

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LS1 engines outside of North America have higher recommended oil viscosities though. I asked someone from Australia what their Holden LS1 owner's manual said and he told me the following:
quote:
10w30 if not available SG, SH or SJ oil with a viscosity of 20w50 or 15w50.
I wouldn't go with the 50wt oils, but 40 should be fine. [ December 04, 2002, 06:25 AM: Message edited by: Patman ]
 
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And of course M1 0W40 is at the low end of 40 weight spec. SS version shoulf be fine for this app IMO particularly if a hotter part of the U.S or Canada. LS1's are everywhere here and many having oil related troubles. Mates Commodore SS had new piston/ring kit fitted but still uses oil albeit at a lesser rate than before. 10W30 M1 factory fill.
 
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I am using Mobil-1 0w-40 synthetic in my 2002 SS. I have only a few hundred miles on it so far (about a month) and everything runs fine. I get about the same gas mileage too, or if it's different it's not enough where I can tell. The reason I went with 0w-40 was because my motor starts tapping about 30 seconds after startup, and is sometimes there at idle and sometimes not. Guessing it might be noisy lifters and valvetrain I hoped the 0w-40 would make the noise go away. It did not. I plan on running this oil for 7000-10k miles or till June, I do mostly easy highway driving so I figure it's good for that long, and I hope to do an analysis on it when the time comes. I will go back to a 30wt oil, probably Mobil-1 synthetic. With the LS1 motor (Camaro's Firebirds and Corvettes), I have the GM service manual for my car and it states that for the LS1 5w-30 weight is recommended, however 10w-30 and 10w-40 weights are acceptable given the climate and availability of oils. The only warning that is written is "Do not use 20w-50 oils". Again, ?w-40 weight oils are okay according to the service manual, and I think you can also conclude that from info in the owner's manual too. [ December 05, 2002, 02:20 PM: Message edited by: 1 FMF ]
 
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I think the 0W-40 is fine, but only in the summer. I looked at the viscosities and the 0W-40 is dead smack in the middle between 10W-30 and 15W-50 M1. There is absolutely no reason to have that kind of viscosity in the engine at low temperatires.
quote:
Originally posted by 1 FMF: I am using Mobil-1 0w-40 synthetic in my 2002 SS. I have only a few hundred miles on it so far (about a month) and everything runs fine. I get about the same gas mileage too, or if it's different it's not enough where I can tell. The reason I went with 0w-40 was because my motor starts tapping about 30 seconds after startup, and is sometimes there at idle and sometimes not. Guessing it might be noisy lifters and valvetrain I hoped the 0w-40 would make the noise go away. It did not. I plan on running this oil for 7000-10k miles or till June, I do mostly easy highway driving so I figure it's good for that long, and I hope to do an analysis on it when the time comes. I will go back to a 30wt oil, probably Mobil-1 synthetic. With the LS1 motor (Camaro's Firebirds and Corvettes), I have the GM service manual for my car and it states that for the LS1 5w-30 weight is recommended, however 10w-30 and 10w-40 weights are acceptable given the climate and availability of oils. The only warning that is written is "Do not use 20w-50 oils". Again, ?w-40 weight oils are okay according to the service manual, and I think you can also conclude that from info in the owner's manual too.
 
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quote:
Originally posted by sprintman: And of course M1 0W40 is at the low end of 40 weight spec. SS version shoulf be fine for this app IMO particularly if a hotter part of the U.S or Canada. LS1's are everywhere here and many having oil related troubles. Mates Commodore SS had new piston/ring kit fitted but still uses oil albeit at a lesser rate than before. 10W30 M1 factory fill.
It's actually right in the middle of the 40 spread at (if I remember right) 14.6 @ 100C.
 
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quote:
Originally posted by Alex D: There is absolutely no reason to have that kind of viscosity in the engine at low temperatires.
Why do you say that? Cold weather is a startup/pumpability issue. Mobil1 0w40 pour point is -65f. Pumpability limit is -53f. It's just a very consistent 40 which is within manufacturers spec. IMO, FMF is ahead of the game. Manufacturers would specify good oil with a wide range if they thought people would pay for it. David
 
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quote:
Originally posted by dbrowne1: [QUOTE]It's actually right in the middle of the 40 spread at (if I remember right) 14.6 @ 100C.
14.4, but you're right, right in the middle.
 
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