[OctaneZ28]

...you should avoid using Castrol GTX motor oil!

Here is an article and link about this from GM TechLink

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http://216.182.211.32/techlink/images/issues/jul07/TLjul07e.html#story3

GM Approved Engine Oils Update

An updated version of the GM6094M Approved Engine Oils list is available in the Reference Guide section of the TechLink website. GM has recently conducted a test program to check several of the oils on the Approved Oils list for compliance with the GM6094M specification. One of the oils tested during this program, Castrol GTX, was found not to meet the GM6094M specification, and so this oil has been removed from the Approved Oils list.

Watch for further updates to the GM6094M and GM4718M Approved Products list on the GM Techlink website.

 

[brandonppr]

Wow.

I use Royal Purple but my grandfather uses Castrol

 

[USA1Camaro]

Mobil 1 for me.

 

[Luwinkle]

I use whatever my dad buys in bulk..mainly the cheap ****.

2 years of it and my truck is still running, so can't be that bad .

 

[fbodygrad]

wow i was using castrol in my 3.4, the z gets mobil 1 though

 

[OverAnxious]

Mobil 1 for me.

x2

 

[TBSS_in_the_D]

Mobile 1 in the TBSS!

 

[Devryn]

I've used Penzoil since I was 16. I certainly won't be switching. (although I plan to run Purple when I get my 5th Gen)

 

[Jinx]

Mobil 1 in all my cars. I plan on purple or mobil on the 5th gen, prolly mobil 1.

 

[Luwinkle]

I've never even HEARD of Royal Purple.


I fail.

 

[54inches]

I have ALWAYS run Castrol GTX in all my street engines, but I change the oil at 2000-2500 miles. I have pulled engines apart that looked new inside....most recently 191,000 Big Block.


Wow, my family has been using Royal Purple for years! Good old Texas oil.

One of the BEST oils in the world!

 

[brandonppr]

I've never even HEARD of Royal Purple.


I fail.

good stuff

http://www.5thgen.org/forum/showthread.php?t=1338&highlight=royal+purple