0w-40
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Joined: Mar 2006
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Bane, I'd agree with Brad. If (when you switched to 0w40 weight) you're oil consumption and smoking stopped, you have bigger problems that need to be further addressed than using the oil weight bandaid.
I did the same when I had my old motor in my camaro (original 267 V8 - what a freakin turd!!!). I remedied that by putting a mild 355 (almost double the torque, and more than double the hp of the 267) in it's place.
I did the same when I had my old motor in my camaro (original 267 V8 - what a freakin turd!!!). I remedied that by putting a mild 355 (almost double the torque, and more than double the hp of the 267) in it's place.
Nothing stopped, it just decreased. The car only smoked @WOT after 4500 rpm or so, and it was worse if I had been babying it for a while(a week or so) and then nailed it. As far as the consumption, it went from 2 quarts to 1 between oil changes. It may have problems, but, from what I have read, no worse than any number of other LS1's. 
Originally Posted by Stang's Bane
. As far as the consumption, it went from 2 quarts to 1 between oil changes. It may have problems, but, from what I have read, no worse than any number of other LS1's.
Please dont ever say that burning 2 qts of oil is normal because it isnt, i dont care what the internet experts here tell you, its common sense. To burn oil it only has a few places to go, an oil leak to the ground, through the PCV, past the rings and into your chambers to be burned, or through your worn valve seals into the chamber to be burned. And if the PCV is pushing lots of oil through it then most likely the piston rings are worn out an allowing excessive blowby which increases crankcase pressure which is why more oil would get sucked through the PCV. Worn rings and oil through the PCV are like a double edged sword.
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We can rule out valve seals, they are new. As far as the rest, I dunno?? It ran good and besides a little piston slap at COLD(below 40 deg)startup, it was quiet. It is coming out anyway.
Last edited by Stang's Bane; Mar 27, 2007 at 08:54 AM.
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It has been posted on here several times that M1 5w30 is a THIN 30w, and that the 40w would be better. IF you were running M1 30w, that could have been some of the issue because the oil was thin, maybe?
I am going to send in my Castrol 0w30 for analysis and then do the same with M1 0w40 to see the differences in viscosity and what not.
I am going to send in my Castrol 0w30 for analysis and then do the same with M1 0w40 to see the differences in viscosity and what not.
Like a lot of guys I switched from 5-30 weight Mobil 1 to the 0-40 Mobil 1..Mobil 1 is a very thin 30 weight oil..the Mobil 1 0-40 is closer to what real 30 weight is...I have been running the 0-40 for 90,000+ miles and I run the car like a hot rod it is a daily driver that gets 30000+ miles a year put on it. I run 0-40 Mobil 1 year around .. I use a half a quart every 3000 miles...to me that exceptable oil consumpiton for a car with 130000+ miles and over 400 RWHP under the hood .. 
Are there any posts with results of analysis on M1 0w40, 5w40 and GC 0w30?
I have been searching around trying to find some real info, but have yet to find any. I read that the M1 5w40 may be a better choice, but without the oil tests or results its hard to find out why. If anyone has links can you post up or PM me?
I have been searching around trying to find some real info, but have yet to find any. I read that the M1 5w40 may be a better choice, but without the oil tests or results its hard to find out why. If anyone has links can you post up or PM me?
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Joined: Mar 2006
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So based on your philosphy, Bane, even if you had a brand new crate LS1 it'd burn 1 or 2 quarts between oil changes and you'd consider that "normal"?? I'm not mocking you in the least, I'm just trying to figure out how your brains working.
When I put my 355 in, if it had oil consumption from the get-go I'd take it out and tear it back down in a heartbeat. Lucky for me it has 30psi at idle. I'm running 10W30 synthetic and at 1400rpms at startup (cold engine) it has between 50-60 psi (high volume pump).
Oil consumption is NOT a normal problem!!!!
When I put my 355 in, if it had oil consumption from the get-go I'd take it out and tear it back down in a heartbeat. Lucky for me it has 30psi at idle. I'm running 10W30 synthetic and at 1400rpms at startup (cold engine) it has between 50-60 psi (high volume pump).
Oil consumption is NOT a normal problem!!!!
If any of you guys have any oil questions or problems I would suggest that you PM Patman...he is the resident oil guru..he has posted many times on oil related sujects and really knows his stuff..GM will tell you that a quart every 1000 miles is normal oil consumption 
with the LS series engine..which to me is excessive ... 
with the LS series engine..which to me is excessive ...
Originally Posted by WS6FirebirdTA00
Are there any posts with results of analysis on M1 0w40, 5w40 and GC 0w30?
I have been searching around trying to find some real info, but have yet to find any. I read that the M1 5w40 may be a better choice, but without the oil tests or results its hard to find out why. If anyone has links can you post up or PM me?
I have been searching around trying to find some real info, but have yet to find any. I read that the M1 5w40 may be a better choice, but without the oil tests or results its hard to find out why. If anyone has links can you post up or PM me?
The 5-40 M1 is out of production now..if you find some it is the last that was produced..
Originally Posted by slt200mph
The 5-40 M1 is out of production now..if you find some it is the last that was produced..
When I asked the dealer about the consumption, the answer I received was that the amount that I had was not an issue. I am not saying they were right, I am just stating what they told me. The LS1 has a well documented history of higher oil consumption than a SBC. The reason I received was something to do with the ring pack, it being a "low tension" design. Also, a lot of the Corvette's had the problem due to having synthetic in them from the factory. The rings never seated that good.
I realize that all LS1's do not smoke, but alot of them do. I don't like the idea at all myself, but I have come to accept it.
I realize that all LS1's do not smoke, but alot of them do. I don't like the idea at all myself, but I have come to accept it.
I started out running M1 5w-30 but like most I experienced higher then “normal” oil consumption. Now I run GC 0w-30 in my LS1 but will run M1 0w-40 if I can't find the GC.....I've had good results with both.
I believe I read on bob the oil guy’s forum that they’re actually pretty close in thickness if you consider GC 0w30 to be on the thicker side of 30 weight oils, M1 0w-40 to be a thinner 40 weight, and M1 5w-30 to be a thinner 30 weight. That might not of come out right but just think of it as M1 5w-30 to have an “actual” weight of 5w-31.5, GC 0w-30 as 0w-36.2, and M1 0w-40 as 0w-40.5…….btw, my “actual” weights were just made up but I think you get my drift on how oils of the same advertised weight can be thicker or thinner.
After all that……nope, no problem switching to M1 0w-40 IMO.
I believe I read on bob the oil guy’s forum that they’re actually pretty close in thickness if you consider GC 0w30 to be on the thicker side of 30 weight oils, M1 0w-40 to be a thinner 40 weight, and M1 5w-30 to be a thinner 30 weight. That might not of come out right but just think of it as M1 5w-30 to have an “actual” weight of 5w-31.5, GC 0w-30 as 0w-36.2, and M1 0w-40 as 0w-40.5…….btw, my “actual” weights were just made up but I think you get my drift on how oils of the same advertised weight can be thicker or thinner.
After all that……nope, no problem switching to M1 0w-40 IMO.
Originally Posted by WS6FirebirdTA00
Is it really? I thought it was just labeled differently. I guess those were just old posts, but I thought it was the new turbo diesel packaging?
When I was on the hot rod magazine power tour last year I made a new friend and he was the guy in charge of the Mobil 1 display and promotion on the tour..we talked a little about oils and he mentioned that the 5-40 M1 was going out of production..I have not seen it in a long time..there may be some still out there but I guess it might be real hard to find..