I've posted this before....here it is again.

My son was a GM engineer before he went to Dupont.

It is true that GM specs it fluids...but aside from that, M1 was chosen because of a $ licensing deal similar to that of Pennzoil and Ferrari.

GM plans to make some xtra $ on the dexos™ engine oil specification as well.

Have you noticed in movies that you see certain name brand stuff like Dell,Apple & Pepsi? The Co's paid to have them there.Same thing.

ns3

 

The LS1 is designed to last 200,000 or more miles using GM recommened Mobile 1. That is a given so why change to an unknown?

 

Thats not exactly true!!!
I do find it very entertaining to see some of these post on this oil issue.. Truth is so far from the urban legend found here.. As Ive said many times, Dave Hill wanted an engine that blew away the benchmark testing of any other automotive platform by insisting on an engine that would test to 200,000 miles... The C5 is Not a F body car. The C5 is a bottom feeder due to body design... Heat is the killer. AT the time No other oil manufacturer could offer an engine oil that could sustain lubricity throughout the operating temps found in a C5. This crap about Mobil being the lowest bidder is just that .. CRAP".... just goes to show you just how many idiots post their opinion on this forum with no basis for their rants... When we ran our mules and while developing the algorithms for the C5 OLM system we were able to bench mark 200,000 miles and when we torn those mules down.. every critical was still within spec... So for those who think it's all conspiracy and snake oil....put drain oil in your car...its cheap ....This post is not in any way meant to say that 99 vett babycar is one of these idiots.,,, I was just addressing the statement about no one on this forum knows better or invested any time.

 

Is this what you meant?

http://www.youtube.com/watch?v=QP6BY68OYxs

 

definitely mobil-1. my 98 coupe went approximately 10 miles with 0 oil pressure (long story) and there was no damage to the engine whatsoever. because of this, i will be a lifelong fan of mobil-1.

 

Jumpin jimminy, not another gude dernit oil thinggee.

The horse must have risen. Put it down again......................

 

Sounds like you worked on the C5 project. Thats a pretty reliable source if so.

I've heard within the last year or 2 that Mobil one synthetic is not as good as it used to be.... just another Group III oil like alot of SYN's out there. I Don't know if it's really true but I've seen it multiple times to ask questions. It may have been designed to work with the LS engines well back then.... but what about now if it has changed?

Not trying to bust ***** on ya... I'm just curious of my uncertainty. Maybe you could give us further insight?

 

WOW... this is one guy that you should stay away from... this guy actually thinks oil is oil... and that there are no differences... what a wealth of nothingness..One of the people I always tell newbies to be careful about who they listen to.. this guy" yelovette " is one of those people you should not be listening too... as a newbie yelovette you should be doing more listening and less talking because its obvious you know nothing about automotive technology. When you begin to type something, you should think twice before you hit the enter button because with that key stroke, you only show your ignorance...
Welcome to the forum
Bill aka ET

Here is the real scoop.. Mobil 1 no longer makes semi synthetic oil.
There is a new formula Mobil one called Extended Performance.. there is also the Original Mobil one.. both of these oils specific to a C5 contain and are General Motors 4718M spec ed...You can use either of these in your C5... the oil Formulation does not come from God.. it comes from science, and it does not occur naturally from the ground.
Science alters the natural DNA of the polymer string.

AS I said above Mobil 1 is still GM certified for a C5.. the Newer formula Known as Extended Performance( Not to be confused with extended life) is much like Castrol Edge... which also is GM spec-ed for a C5.. what you need to be sure of is that the oil be GM 4718M. No matter who the manufacturer is. This spec is very specific to the high heat range found in a C5.
I hope this helps to clear up any confusion, either about the oil for your C5, or who you should not be listening too.
FYI I saw someone on this forum the other day that said , and I quote "GM says you can use mobile one for 15,000 miles " but I still change my oil every 3,000 miles... OMG... I could not look aways but I did not get into it with him.. GM NEVER said you can use Mobil One for 15,000 miles NEVER... yet this person somehow someway actually believed that... I don't think people come here to deliberately lie.. but there are many that read into things.. don't have a logical mind, or allow their wallet to dictate how they think... these are those people that are too cheap to buy the correct stuff...be it the proper octane gas, or the correct oil. One of the pet expression we had at GM was "making it idiot proof".... needless to say, many of us here have seen a genetically altered idiot ( higher class of Idiot ) on this forum which goes far and away above anything we could have imagined... We have all seen the guy who runs 89 octane in his car all the time with no problems... these people think the car wont run on 89 octane, and if it does run it must be OK. Now wouldn't this be a home run in marketing if we could have made a 400 + HP sports car that could run without issue on regular gas.. Don't you think we would have advertised that? The logic that some of these people use is just plain illogical. Again, the wallet is feeding the brain .OK IM done now..
Bill aka ET

 

That looks like Black Lake test track !!! LOL

 

It is true that GM uses synthetic in the 'vette because of the temperature range issue discussed above. However, there are more choices out there than M1. Its about the $, its always about the $. M1 is a good oil no doubt, but there are better. Ultimately going with M1 was just a good business decision.
From the research I've done, Royal Purple is a better performer than M1...plus its purple and that is

 

You forgot to add ......."Horsepower TV" says RP is better.

 

Polymers have DNA? I learn something new every day...

 

I enjoyed this thread after ET stepped in. Oh, by the way my 97 saw oil temps around 295 when on the track and my 03Z hit 319 on one hot afternoon. Once I had oil coolers on them the oil temps dropped quite a bit. Non-synthetic oil would have given up at those temps.

Bill

 

As long as you dont do any high performance driving with conventional oil you'd be fine running it. The synthetics will hold up much better to high heat in an endurance event which is why it is speced for a high performance vehicle; the manufacturer expects a good portion of these cars to experience this kind of environment, so was safer to just recommend one oil specification that will cover all bases.

 

"TOTAL CRAP" by the uninformed!!!! Because of the clearances, body design, cooling and GM pulling every oz. of power from these LSX engines, shear becomes a killer, conventional oil wont do well here either, because of thermal breakdown.... of course it will work but it will dramatically reduce engine life....about 74 % of these cars Never see a track. The OIL was spec'd out because Dave Hill wanted a 200,000 mile bench mark engine for this platform... that's the real scoop and some more inside information in its development...At the time no other automotive manufacturer demanded a 200,000 mile bench marked engine from its design team... the C5 was an industry first. Many members here have well over 300K and some with over 400K on their C5 without any internal repairs. But of course they uses what we recommended and follow the OLM system. Don't know why so many uneducated people on this forum ( uneducated in Automotive design or technology ) feel they know better than the engineers who developed this car. It took almost 1000 man years of education by the Gm design team to produce this car, yet some Yahoo who ( ctusser makes concrete forms ) knows better... Another one you should put on your list of people not to listen too here.
I just have to scratch my head.

 

Thanks Bill, as you know I always call them like I see them...I am not quite animated as I use to be here on this forum, many old timers wish the Old ET would come back, I get Pm's from time to time egging me on to bring back the real Evil-Twin... I'm just a hollow shell now that I am old and crotchety...

 

Petroleum Polymer string

 

So you are saying that the choosing of M1 was strictly done on a technical basis and that financial considerations had nothing to do with it?

ns3

 

Sir...where in the world did you get that pile of hooey from? You will NOT be "Just fine" using Conventional oil in a C5 with an (LSX) engine...your statement about conventional oil in a C5 is rediculous

 

Bull and Chit...you are as good as you have ever been...maybe better