[Z06] What oil do you run? any failures??
05-10-2014, 08:47 AM
#22
Burning Brakes
Didn't AZ start out saying he had a cam and lifter fail ,and didn't I ask him to explain the details? I didn't have a fail because at 7k mi. I did $ 10.000 H/C/i sorry if you're confused.
Last edited by ToppThat; 05-10-2014 at 08:58 AM.
05-10-2014, 11:22 AM
#23
Race Director
Member Since: Sep 2007
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C6 of Year Finalist (performance mods) 2019
I'd agree with glenB, that any oil brand discussion should include the car usage and the internal mods. Just saying xxxxx miles with no problems with xyz brand oil is meaningless without knowing the conditions the oil was subjected to.
The other factor is if any failure is directly related to lubrication and not to include starvation.
In regards to the GM C7 racing specs, it also relates to the issues caused by the switch to direct injection.
The other factor is if any failure is directly related to lubrication and not to include starvation.
In regards to the GM C7 racing specs, it also relates to the issues caused by the switch to direct injection.
05-10-2014, 11:28 AM
#24
Tech Contributor
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Based on previous posts, I think you should rephrase the question to read:
What kind of oil do owners of highly modified, racing oriented LS motors, use?
My belief is that once you change something as in increasing the valve spring pressure or specific engine output, you have taken the motor out of the street level oil and into more of the racing type oils. After that, is it intended for drag race or road race type driving.
Basic oils today, and I consider Mobil1 to be a basic oil, are based on the OEM specifications, output and GENERAL usage of the vehicle. The forces at play in the crank/rod mating is different between stock Vs modified and can actually squeeze out the oil between the bearing and the rod journal if the oil is too thin, for what ever reasons. Same goes with the cam lobe to roller lifter interface.
Point..... the C7 Z51 uses 5w30 from the factory. Chevrolet released a Track Prep Guide in which it says to change the oil to Mobil1 15w50. Which tells me that in stressed conditions, 5w30 doesn't cut it.
For your reading enjoyment
http://www.enginelabs.com/engine-tec...e-differences/
http://www.mobiloil.com/USA-English/..._Oil_FAQs.aspx
What kind of oil do owners of highly modified, racing oriented LS motors, use?
My belief is that once you change something as in increasing the valve spring pressure or specific engine output, you have taken the motor out of the street level oil and into more of the racing type oils. After that, is it intended for drag race or road race type driving.
Basic oils today, and I consider Mobil1 to be a basic oil, are based on the OEM specifications, output and GENERAL usage of the vehicle. The forces at play in the crank/rod mating is different between stock Vs modified and can actually squeeze out the oil between the bearing and the rod journal if the oil is too thin, for what ever reasons. Same goes with the cam lobe to roller lifter interface.
Point..... the C7 Z51 uses 5w30 from the factory. Chevrolet released a Track Prep Guide in which it says to change the oil to Mobil1 15w50. Which tells me that in stressed conditions, 5w30 doesn't cut it.
For your reading enjoyment
http://www.enginelabs.com/engine-tec...e-differences/
http://www.mobiloil.com/USA-English/..._Oil_FAQs.aspx
However, I do want to say I have been running LS engined Corvettes since 97 using Mobil 1 5W30 with only one engine issue. That was when my LS7 dropped a valve head 3 years ago. All 3 of those cars saw extensive track usage.
Bill
Last edited by Bill Dearborn; 05-10-2014 at 11:31 AM.
05-10-2014, 03:01 PM
#27
Le Mans Master
Thread Starter
My Cam/lifter failed while driving on the street (and not aggressivley at the time) Only had one track day prior to failure.
I purchased car from Original owner with 6500miles on it in 2011 he had had the oil changed on it 3 times while he owned it. Using Mobile 1 5- 30 each time.
No mods had been done to the car prior to failure. I had changed the oil once (mobile 5-30) at about 11k IIRC. Since the failure I have run Amsoil synth 5-30 and a wix filter. I have checked for valve guide wear and have at least 2 guides that are out of spec.
I'm trying to find a decent area GM shop that wont give me grief about doing a wiggle check.
I purchased car from Original owner with 6500miles on it in 2011 he had had the oil changed on it 3 times while he owned it. Using Mobile 1 5- 30 each time.
No mods had been done to the car prior to failure. I had changed the oil once (mobile 5-30) at about 11k IIRC. Since the failure I have run Amsoil synth 5-30 and a wix filter. I have checked for valve guide wear and have at least 2 guides that are out of spec.
I'm trying to find a decent area GM shop that wont give me grief about doing a wiggle check.
05-10-2014, 05:50 PM
#28
Le Mans Master
05-10-2014, 07:21 PM
#29
Team Owner
Was mostly looking to see if guys running something good like the Redline 10w40 which I just switched to are having good success with it
DH
05-10-2014, 07:24 PM
#30
Team Owner
When I attended the NCM HPDE at Sebring the GM Engineers at the morning drivers meeting strongly stressed that C7s had to have the heavier duty oil if they were being driven in any group above the novice level.
However, I do want to say I have been running LS engined Corvettes since 97 using Mobil 1 5W30 with only one engine issue. That was when my LS7 dropped a valve head 3 years ago. All 3 of those cars saw extensive track usage.
Bill
However, I do want to say I have been running LS engined Corvettes since 97 using Mobil 1 5W30 with only one engine issue. That was when my LS7 dropped a valve head 3 years ago. All 3 of those cars saw extensive track usage.
Bill
Did they say thicker as in 10w40 would be okay or 15w50 ….. period.
DH
05-10-2014, 07:26 PM
#31
Team Owner
My Cam/lifter failed while driving on the street (and not aggressivley at the time) Only had one track day prior to failure.
I purchased car from Original owner with 6500miles on it in 2011 he had had the oil changed on it 3 times while he owned it. Using Mobile 1 5- 30 each time.
No mods had been done to the car prior to failure. I had changed the oil once (mobile 5-30) at about 11k IIRC. Since the failure I have run Amsoil synth 5-30 and a wix filter. I have checked for valve guide wear and have at least 2 guides that are out of spec.
I'm trying to find a decent area GM shop that wont give me grief about doing a wiggle check.
I purchased car from Original owner with 6500miles on it in 2011 he had had the oil changed on it 3 times while he owned it. Using Mobile 1 5- 30 each time.
No mods had been done to the car prior to failure. I had changed the oil once (mobile 5-30) at about 11k IIRC. Since the failure I have run Amsoil synth 5-30 and a wix filter. I have checked for valve guide wear and have at least 2 guides that are out of spec.
I'm trying to find a decent area GM shop that wont give me grief about doing a wiggle check.
DH
05-10-2014, 09:40 PM
#32
Burning Brakes
. To be honest it's still in the case and will be used for my dyno tune as soon as my builder finishes putting Jesel rockers on. I always used RP HPS 5/30,but now it can use 10/40,and like what I heard about redline.
05-11-2014, 12:31 AM
#33
Burning Brakes
05-11-2014, 01:11 AM
#34
Drifting
05-11-2014, 06:38 PM
#36
Pro
I also don't understand GM's reasoning for 15w50 in the C7, for track duty. Not sure if they felt 30wt wasn't thick enough at track temps, or they don't like the lower anti-wear levels in API SN energy conserving weights.
05-12-2014, 08:02 PM
#38
Drifting
Considering a couple of C7's at the NCM Sebring event had oil temp lights come on, my bet is they put alot of heat in the oil and need the thicker film at 300*.
Not to mention the 5w30 EPA oil's lack of?
I am seeing even Redline 10w40 gets "very" thin above 250* much less 280*.
http://forums.corvetteforum.com/auto...data-logs.html
But on the street with a cam I would think something like Redline 5w30.
Not to mention the 5w30 EPA oil's lack of?
I am seeing even Redline 10w40 gets "very" thin above 250* much less 280*.
http://forums.corvetteforum.com/auto...data-logs.html
But on the street with a cam I would think something like Redline 5w30.
Last edited by blkbrd69; 05-12-2014 at 08:06 PM.
05-12-2014, 08:31 PM
#39
I would think that the heavier weight is recommended due to the higher oil temperature involved in track use.
05-12-2014, 09:26 PM
#40
Pro
I read that the "lower anti-wear levels" are probably an unfounded or exaggerated concern amongst most consumers (other more cat-friendly additives are added or increased to compensate for the lower levels of zinc and phosphorous).
I would think that the heavier weight is recommended due to the higher oil temperature involved in track use.
I would think that the heavier weight is recommended due to the higher oil temperature involved in track use.