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View Poll Results: Which oil do you use?
Amsoil 79 22.13%
Castrol 19 5.32%
Champion 0 0%
Chevron 0 0%
Conoco 0 0%
Citgo 0 0%
Havoline 1 0.28%
Interstate 0 0%
Kendall 1 0.28%
Lowe 0 0%
Marathon 0 0%
Mobil 1 224 62.75%
Motorcraft 0 0%
National 0 0%
PennZoil 4 1.12%
Quaker State 3 0.84%
Redline 10 2.80%
Royal Purple 11 3.08%
Valvoline 5 1.40%
Voters: 357. You may not vote on this poll

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Old 04-12-2016   #141
Mystic ZR-1
 
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Join Date: Jan 2010
Location: Mystic CT
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Default Re: Which oil do you use

Why is 10w40 so popular?
GM said 10w30.
Ya know, they're really smarter than we give
them credit for...
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Old 04-12-2016   #142
rush91
 
Join Date: Feb 2016
Location: Carterville Illinois
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Default Re: Which oil do you use

Quote:
Originally Posted by Mystic ZR-1 View Post
Why is 10w40 so popular?
GM said 10w30.
Ya know, they're really smarter than we give
them credit for...
Good question, one I have wondered as well. The way I understand, GM started using Mobil 5W-30 on 1993 cars and beyond. When I bought my '91, I had no idea what was in it. After most here use 10W-40 Amsoil, I went same route. High Zinc, has all the GM ratings, etc.......Since then, I have noticed a smoother idle, and no " chain rattle" at all. That maybe due to the new AC Delco PF970C oil filter as well. But I hope it will run cooler some what in the summer with the 10W-40 as well. I maybe totally wrong with my conclusion, time will tell.
But also, I would think motor oils now are way better than in the early 90s. But this is an endless conversation, I think it boils down to preference, easy of availabilty, price as well.
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Old 04-18-2016   #143
BigJohn
 
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Default Re: Which oil do you use

Quote:
Originally Posted by Mystic ZR-1 View Post
Why is 10w40 so popular?
GM said 10w30.
Ya know, they're really smarter than we give
them credit for...
15w50

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Old 07-08-2016   #144
BigIke
 
Join Date: Aug 2014
Location: Montgomery TX
Posts: 263
Default Re: Which oil do you use

M1 diesel oil... 1200 ppm zinc

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Old 07-09-2016   #145
SAM/CH ZR-1
 
Join Date: Jul 2005
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Default Re: Which oil do you use

At the moment I do test the Valvoline VR1 Racing 10w-60 Premium Synthetic Blend Engine Oil. It also has zinc.
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Old 07-11-2016   #146
Billy Mild
 
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Default Re: Which oil do you use

Quote:
Originally Posted by SAM/CH ZR-1 View Post
At the moment I do test the Valvoline VR1 Racing 10w-60 Premium Synthetic Blend Engine Oil. It also has zinc.
Make sure to change this often. The racing oil has little to no detergents.
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Old 07-11-2016   #147
BigIke
 
Join Date: Aug 2014
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Default Re: Which oil do you use

I'm thinking about switching to Quaker State ultra, it has the highest wear protection by far

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Old 08-07-2016   #148
Andreas
 
Join Date: Jul 2016
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Default Re: Which oil do you use

I have a lot of Kendall GT1 10W30 API SL is there any problem to use this in my 90 ZR1?
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Old 08-08-2016   #149
Paul Workman
 
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Default Re: Which oil do you use

Quote:
Originally Posted by Andreas View Post
I have a lot of Kendall GT1 10W30 API SL is there any problem to use this in my 90 ZR1?
Some helpful info:

http://www.zr1specialist.com/HAT%20W...5%20Engine.pdf

http://www.drivenracingoil.com/news/...-in-motor-oil/
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Old 08-16-2016   #150
Billy Mild
 
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Default Re: Which oil do you use

http://www.amsoil.com/shop/by-produc...?code=AMOQT-EA

https://www.amazon.com/Mobil-120770-...0+high+mileage

What is the thoughts of running 10w-40 in the Corvette vs. the normal 10w-30? I am worried that the thicker oil will cause issues down the road such as oil pressure or seals busting out? Am I just paranoid or what?
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