Mobil1 0w40: LS7 Corvette Z06

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Originally Posted By: buster
Mobil 1 0w40 is used in the LS7 in Europe.


I researched that a while back, including getting on a British car forum. Dexos1 is now what is recommended.

DH
 
Originally Posted By: Loobed


The copper is incredibly low for an LS engine that only has 10,000 miles. I might have to try M-1 0-40 in my truck.



What is the significance of the copper?

DH
 
Originally Posted By: CATERHAM
Looks fine for a new engine.

What maximum oil temp's and oil pressure readings at max' rev's do you see at the track with the M1 0W-40?


Thanks.

Max track temp last time was 260* and time before that was 240*
Not sure what the oil pressure is at 7k RPM at full temp. I will try to look this weekend. I know its alot better than the 5w30. Pretty sure its about 60 psi.

DH
 
Originally Posted By: Dirty_Howie
Originally Posted By: Loobed


The copper is incredibly low for an LS engine that only has 10,000 miles. I might have to try M-1 0-40 in my truck.



What is the significance of the copper?
DH


Oil cooler or bearing material is where the copper is coming from mainly...

Christian
 
Originally Posted By: miami993
Originally Posted By: Dirty_Howie
Originally Posted By: Loobed


The copper is incredibly low for an LS engine that only has 10,000 miles. I might have to try M-1 0-40 in my truck.



What is the significance of the copper?
DH


Oil cooler or bearing material is where the copper is coming from mainly...

Christian


If the copper was coming from the bearings, then the engine would be knocking up a storm as all the bearing materiel would be gone and the oil pressure would be way off. As we know, copper is often high in GM engines.
 
Originally Posted By: Dirty_Howie
Originally Posted By: CATERHAM
Looks fine for a new engine.

What maximum oil temp's and oil pressure readings at max' rev's do you see at the track with the M1 0W-40?


Thanks.

Max track temp last time was 260* and time before that was 240*
Not sure what the oil pressure is at 7k RPM at full temp. I will try to look this weekend. I know its alot better than the 5w30. Pretty sure its about 60 psi.
DH

260F is likely hotter than optimum for the spec' M1 5W-30 but not by much. 60psi is higher than necessary for the Z06 or any Vette for that matter, as 50psi is closer to optimum.
I'd suggest a 50/50 mix of M1 5W-30/0W-40 for next your next OCI.
If it will be a while before your next OCI, use M1 0W-20 or better still the Mobil made Toyota 0W-20 for any topping up that may be necessary.

Cheers!
 
Originally Posted By: Loobed

The copper is incredibly low for an LS engine that only has 10,000 miles. I might have to try M-1 0-40 in my truck.


We run it in all our higher mileage fleet trucks (6.0 GMC's) if it's on sale. Factory recommended for my car as well, so it's one of my favorites.
 
Thanks, but I only had .25 Quart make up on last fill. So probably will leave it as is.

But I will definitely try to get you an accurate reading of my high RPM/ high oil temp pressure tomorrow when I will be at the track. (Please feel free to bug me if I forget to post it)

DH
Originally Posted By: CATERHAM
Originally Posted By: Dirty_Howie
Originally Posted By: CATERHAM
Looks fine for a new engine.

What maximum oil temp's and oil pressure readings at max' rev's do you see at the track with the M1 0W-40?


Thanks.

Max track temp last time was 260* and time before that was 240*
Not sure what the oil pressure is at 7k RPM at full temp. I will try to look this weekend. I know its alot better than the 5w30. Pretty sure its about 60 psi.
DH

260F is likely hotter than optimum for the spec' M1 5W-30 but not by much. 60psi is higher than necessary for the Z06 or any Vette for that matter, as 50psi is closer to optimum.
I'd suggest a 50/50 mix of M1 5W-30/0W-40 for next your next OCI.
If it will be a while before your next OCI, use M1 0W-20 or better still the Mobil made Toyota 0W-20 for any topping up that may be necessary.

Cheers!
 
Originally Posted By: SteveSRT8
Originally Posted By: Loobed

The copper is incredibly low for an LS engine that only has 10,000 miles. I might have to try M-1 0-40 in my truck.


We run it in all our higher mileage fleet trucks (6.0 GMC's) if it's on sale. Factory recommended for my car as well, so it's one of my favorites.


Why do you think GM recommends the 0w40 for your GM engine but not the LS7 ???


DH
 
Might want to read that one again... you missed it.

The 0W-40 is factory recommended for my CAR, not any of my trucks. We use it in the high mileage ones (we own a fleet) that would use too much of the factory recommended 5w-30. M1 0W-40 is a terrific blend. If it's good enough for a 500+ HP Mercedes V8 then it's good enough for me!

I've also seen 300 degrees on road courses in my car, and the oil has been just fine per analysis.
 
Sorry, thought SRT8 was GM. Its Dodge right? ..... sorry.

Question still stands. Why do you think its factory for your car and not mine ??

DH

Originally Posted By: SteveSRT8
Might want to read that one again... you missed it.

The 0W-40 is factory recommended for my CAR, not any of my trucks. We use it in the high mileage ones (we own a fleet) that would use too much of the factory recommended 5w-30. M1 0W-40 is a terrific blend. If it's good enough for a 500+ HP Mercedes V8 then it's good enough for me!

I've also seen 300 degrees on road courses in my car, and the oil has been just fine per analysis.
 
Originally Posted By: Dirty_Howie
Sorry, thought SRT8 was GM. Its Dodge right? ..... sorry.

Question still stands. Why do you think its factory for your car and not mine ??

DH

Originally Posted By: SteveSRT8
Might want to read that one again... you missed it.

The 0W-40 is factory recommended for my CAR, not any of my trucks. We use it in the high mileage ones (we own a fleet) that would use too much of the factory recommended 5w-30. M1 0W-40 is a terrific blend. If it's good enough for a 500+ HP Mercedes V8 then it's good enough for me!

I've also seen 300 degrees on road courses in my car, and the oil has been just fine per analysis.



I would imagine it's an SRT thing. They tweak the cars and have quite a bit of autonomy from the Chrysler hierarchy.

GM is very Corporate, and thus the oil recommendations are very similar. The LS7 is normally very reliable even if modded up a bit, I'm sure your experience is far from typical.
 
Last edited:
Originally Posted By: CATERHAM
....60psi is higher than necessary for the Z06 or any Vette for that matter, as 50psi is closer to optimum.....


Back a few years when I was building S/B Chevy's we went with the tried and true 10psi for every 1000 rpm's, when and why did that change?

ROD
p.s. I have been out of the business for 12 years and I know a lot has changed
 
Originally Posted By: rrounds
Originally Posted By: CATERHAM
....60psi is higher than necessary for the Z06 or any Vette for that matter, as 50psi is closer to optimum.....


Back a few years when I was building S/B Chevy's we went with the tried and true 10psi for every 1000 rpm's, when and why did that change?

ROD
p.s. I have been out of the business for 12 years and I know a lot has changed


You are correct ROD...in the last 40 years, 30 years and as in the last 10 years some new steps were made in term of lubricant, as well as in the way you can use them.

Christian
 
One of my cars('06 S2000) has 95 psi of oil pressure and it red lines at 8600 rpm so its still 10 per 1000 for the S2000.
I just have not read or been told by other engine builders that the 10 per 1000 has changed.

ROD
 
Okay at track today oil temps were 240-255* and at 6500+RPM oil pressure was steady at 60




Originally Posted By: CATERHAM
Originally Posted By: Dirty_Howie
Originally Posted By: CATERHAM
Looks fine for a new engine.

What maximum oil temp's and oil pressure readings at max' rev's do you see at the track with the M1 0W-40?


Thanks.

Max track temp last time was 260* and time before that was 240*
Not sure what the oil pressure is at 7k RPM at full temp. I will try to look this weekend. I know its alot better than the 5w30. Pretty sure its about 60 psi.
DH

260F is likely hotter than optimum for the spec' M1 5W-30 but not by much. 60psi is higher than necessary for the Z06 or any Vette for that matter, as 50psi is closer to optimum.
I'd suggest a 50/50 mix of M1 5W-30/0W-40 for next your next OCI.
If it will be a while before your next OCI, use M1 0W-20 or better still the Mobil made Toyota 0W-20 for any topping up that may be necessary.

Cheers!
 
Last edited:
There is nothing wrong with 60psi, the thing is most of the time the OP is much higher than that, meaning the oil is much heavier than necessary most of the time.
In a typical track session of say 25 minutes, for how long of the session has the oil temperature peaked at 255-260F with the corresponding drop in OP to 60 psi?

IIRC the oil pump by-pass point on the LS7 is set at 75-80 psi.
With M1 0W-40 what oil temperature to you need to avoid the oil pump going into by-pass mode at 6,500 rpm?
 
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