Me too; I figure the Chevy engineers are smarter than I am 
[Z06] Oil?
Melting Slicks
Joined: Jul 2008
Posts: 2,000
Likes: 2
As far as I know the my car has always had M1 5W30. I used just about a quart since I got the car and have since switched to Castrol Syntec 5W30. Haven't used a drop yet. Coming from a Subaru a lot of those guys have switched over to Castrol Syntec from M1 in their STi's and they have also noticed the same thing. M1 just isn't what it used to be.
Premium Supporting Vendor
Joined: Aug 2001
Posts: 5,364
Likes: 38
From: King George VA
I use this in my 06 CTS-V daily driver (LS-2 motor): AMSOIL Signature Series Synthetic 0w30
On the track I normally use a 10w40 such as this: AMSOIL SAE Synthetic Premium Performance 10w40 but AMSOIL just came out with a real racing 15w50 and a 10w30. The 10w30 is has a very high viscosity for a 30 grade oil and I'll likely try it next time I get to the track.
On the track I normally use a 10w40 such as this: AMSOIL SAE Synthetic Premium Performance 10w40 but AMSOIL just came out with a real racing 15w50 and a 10w30. The 10w30 is has a very high viscosity for a 30 grade oil and I'll likely try it next time I get to the track.
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C66 Racing #66 NASA ST2, SCCA T2
AMSOIL Dealer (Forum Vendor)
AMSOIL Preferred Customer Program (Members buy at Wholesale - a savings of about 25%)
Le Mans Master
Joined: Jun 2004
Posts: 6,231
Likes: 65
From: Seattle WA
St. Jude Donor '14
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Tech Contributor
Joined: Oct 1999
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From: Charlotte, NC (formerly Endicott, NY)
Bill
