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I am using it in my 2008 GMC Sierra SLT and in my 2009 Cadillac CTS4.
I use the SSO 0W-30 engine oil in both vehicles. The GMC is 100% AMSOIL, I changed everything over, ATF, PS, both axles and added an Injen/AMSOIL Cold Air Intake.
If anyone is interested in using AMSOIL, I will set you up with a Preferred Customer trial membership to buy at wholesale. Follow this LINK and fill out the form completely. Any omissions and it can't be done.
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