[KennyGS]

I'm using this > http://www.mobiloil.com/USA-English/MotorOil/Oils/Mobil_1_Extended_Performance.aspx

 

[KennyGS]

Check the label I dont think Mobil 1 extended performance meets GM 4718M. I would use the normal Mobil 1.

I will say this, I have a 09 Z06 with low miles. It picked up a mild piston slap sound during warm up. I have since switched to Pennzoil Ultra and after about 1,000 miles the piston slap has disappeared. I also only use Top Tier gasoline now.

Hmmm. The DVD that came with my 2010 GS, shows someone pouring extended performance into the oil reservoir.

 

[KennyGS]

http://www.gm.com/corporate/responsibility/environment/maintenance/gm_approved_engine_oils.pdf

 

[KennyGS]

Where is the position of the drops relative to the car? Plumb up from there.

 

[KennyGS]

This is a screen shot from my computer. The window in the middle is from my owner instructional DVD I received with my 2010 GS.

Although it may not be crystal clear, it shows a quart of the Mobil 1 5W30 Extended Performance oil sitting on the engine.

I understand everything being said/discussed, but this is my evidence if anyone at GM questions why I have been using this oil in my LS3.

:buhbye: