15w50 oil who's using it here
Le Mans Master
Joined: Jan 2009
Posts: 6,226
Likes: 33
From: Morton illinois
St. Jude Donor '14-'15
I used to run this because I liked the thickness at higher temps. I had to change to 0-40 though because the 15w was way to thick on start ups with my 3qt stand alone oil cooler. I wouldnt have pressure for a few seconds
Burning Brakes
Joined: Jun 2010
Posts: 769
Likes: 1
From: Columbia TN
That is way to thick of an oil to be using in these engines. At start up that stuff would be like molasses and it's even too thick at normal operating temps. Being too thick at start up is going to wear on your engine.
Racer
Joined: Sep 2011
Posts: 445
Likes: 4
From: San Diego CA
By your logic if your not a GM engineer than you should just blindly take what they have done and assume its the best thing for the car. SO .... If I go out and get coilovers it will not improve the car because I am not an engineer, I dont know much about how dampening and spring rates effect the C5. So since I am not the people who built the car obviously know better so the car will handle worse with the coilovers.
This argument makes no sense at all, GM has recommendations based off NORMAL use of the car but not everyone drives the car the same, some track it some let it sit under a cover for 10 years and drive it 1k miles a year, some its their daily driver. There is no way you are going to have 1 oil that is best for every use.
Thread Starter
Race Director
Joined: Jan 2002
Posts: 11,614
Likes: 350
From: No Where USA
No I am not a petroleum engineer and why would I do this because I have read here that others have done it and am curious if anyone else continues or have done it. And considering that most here are not automotive engineers then why modify cars at all.
I just asked a simple question that has been gone over before and of course the know it all come out to answer and don't add anything to the conversation.
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Le Mans Master
Joined: Jan 2009
Posts: 6,226
Likes: 33
From: Morton illinois
St. Jude Donor '14-'15
well, I AM an engineer, and I have also tried many diff fluids in my car, so I have first hand knowledge as well. You can run this oil and it will be fine, along with 10-30, 10-40, 15-50, 0-40 and so on. They all just have different charicteristics that one may want. I road race, so I see big temps, so the 40-55 weight stuff is better. If you live in a hot climate, id run a thicker oil. Or opposite if you are in a crazy cold area. Its all in how your car reacts to it. Saying anything other than 5-30 is bad is ignorant as XXXX.
kthanxbye
kthanxbye
Last edited by johnodrake; Mar 15, 2012 at 12:31 PM.
Thread Starter
Race Director
Joined: Jan 2002
Posts: 11,614
Likes: 350
From: No Where USA
well, I AM an engineer, and I have also tried many diff fluids in my car, so I have first hand knowledge as well. You can run this oil and it will be fine, along with 10-30, 10-40, 15-50, 0-40 and so on. They all just have different charicteristics that one may want. I road race, so I see big temps, so the 40-55 weight stuff is better. If you live in a hot climate, id run a thicker oil. Or opposite if you are in a crazy cold area. Its all in how your car reacts to it. Saying anything other than 5-30 is bad is ignorant as ****.
kthanxbye
kthanxbye
Thank you. For the answer. That is exactly what I was looking for.
I really hate when people that don't you chit chime in with their answers. I bet most that give those types of answers never get their hands dirty.
Racer
Joined: Sep 2011
Posts: 445
Likes: 4
From: San Diego CA
what are you going to be using the car for?
Just keep in mind that if you use this oil you will want to make sure its up to temp before putting and decent power down or going into high rpm's. If your car is a daily driver I wouldnt run this until summer due to ambient temps in NY.
This really is more of a road racing type oil so if thats what you will be using it for you should be fine as long as its warmed up. I personally wouldnt use it for a daily driver or autocross car, I would go with a 40 weight for those.
Just keep in mind that if you use this oil you will want to make sure its up to temp before putting and decent power down or going into high rpm's. If your car is a daily driver I wouldnt run this until summer due to ambient temps in NY.
This really is more of a road racing type oil so if thats what you will be using it for you should be fine as long as its warmed up. I personally wouldnt use it for a daily driver or autocross car, I would go with a 40 weight for those.
Thread Starter
Race Director
Joined: Jan 2002
Posts: 11,614
Likes: 350
From: No Where USA
what are you going to be using the car for?
Just keep in mind that if you use this oil you will want to make sure its up to temp before putting and decent power down or going into high rpm's. If your car is a daily driver I wouldnt run this until summer due to ambient temps in NY.
This really is more of a road racing type oil so if thats what you will be using it for you should be fine as long as its warmed up. I personally wouldnt use it for a daily driver or autocross car, I would go with a 40 weight for those.
Just keep in mind that if you use this oil you will want to make sure its up to temp before putting and decent power down or going into high rpm's. If your car is a daily driver I wouldnt run this until summer due to ambient temps in NY.
This really is more of a road racing type oil so if thats what you will be using it for you should be fine as long as its warmed up. I personally wouldnt use it for a daily driver or autocross car, I would go with a 40 weight for those.
I was actually thinking 10w40. But just wanted some opinions on this.
Instructor
Joined: Oct 2011
Posts: 106
Likes: 3
From: Hanover NH
what are you going to be using the car for?
Just keep in mind that if you use this oil you will want to make sure its up to temp before putting and decent power down or going into high rpm's. If your car is a daily driver I wouldnt run this until summer due to ambient temps in NY.
This really is more of a road racing type oil so if thats what you will be using it for you should be fine as long as its warmed up. I personally wouldnt use it for a daily driver or autocross car, I would go with a 40 weight for those.
Just keep in mind that if you use this oil you will want to make sure its up to temp before putting and decent power down or going into high rpm's. If your car is a daily driver I wouldnt run this until summer due to ambient temps in NY.
This really is more of a road racing type oil so if thats what you will be using it for you should be fine as long as its warmed up. I personally wouldnt use it for a daily driver or autocross car, I would go with a 40 weight for those.
After reading about the oil temps in these cars getting north of 300 degrees on track I want to use the best oil possible. Redline is the best IMO.
Running on the street the engine takes no abuse at all unless you like getting tickets
Greg
Instructor
Joined: Jul 2011
Posts: 128
Likes: 0
From: Vancouver WA
ok, i use 15w50 in my atv's and motorcycles becsaue they are a wet clutch of where both the engine and transmission share the same oil and energy conserving oil is hard on some clutch material. 15w50 mobil 1 is non-energy conserving oil
All 5w40, 5w50, 10w40, 15w40, 15w50, and 20w50 oils which I have found are not energy-conserving
All 5w40, 5w50, 10w40, 15w40, 15w50, and 20w50 oils which I have found are not energy-conserving
Last edited by Drew1Down; Mar 15, 2012 at 01:53 PM.
