Brew for 06 GTO 6.0L V8

[The Critic]

quote:

---

giving advice to someone else while pretending to be an expert is simply not right.

---

I’ve never acted nor pretended to be an "expert," as I'm not. The owner of the vehicle is ultimately responsible for what he/she decides to use, and they are aware of that.

The suggestion of using the OEM fill with Valvoline Synpower Oil Treatment and the GM approved Mobil 1 5w30 is different that giving someone medical or legal advice. There are substantial consequences to giving incorrect legal or medical advice to one and is a poor comparison between suggesting that one add Synpower Oil Treatment to their oil.

I honestly do not see your link here…I’ve already thought of the worse-case scenario that may occur if this combination does not work…he would’ve simply wasted his money. I do not see any adverse effects to adding this additive to his oil, other than him wasting his money. If the additive caused a problem with the oil, the owner can contact Valvoline. That would not be the case with medical or legal advice.

Also, I hope you understand the activity that goes on in this sub-forum. We give information and advice to each other daily.

 

[pitzel]

The manuals of every GM car I have driven/inspected recently specifically contained admonishments against the use of supplementary oil additives.

If you are worried about a 'warranty', then just run Mobil-1 5W-30 straight up. Forget the other junk.

 

[BigDz]

I have an '04 GTO. After seeing posts saying that the LS1 liked a heavier oil, I used 4 qt's of M1 5W-30 and two qt's of M1 15W-50. It resulted in consistent rod knock. I switched out to M1 5W-30 and have not heard it since.

 

[JMM]

I have had a 2005 Pontiac GTO with the 400 HP LS2 engine for little over a year now. The manual calls for Mobil1 5W-30 that meets GM spec: GM4718M. It's the same oil specified for the new Corvettes. Makes sense as the same engine is used in both cars.

 

[KJA426]

The reason, smartguys, is if the rings aren't completly seated on a brand new engine then you are going to have a ton of zinc and phosphorous heading towards the cat with that much VSOT.

 

[sgtgeek]

Tough crowd......I'll speak from years of experience and lots of UOA's and dyno runs....and as a owner of a highly modified 04 GTO running in the 9's now.....
My "best" ( lowest wear metal) UOA's came from 40 weight oils.....now take into consideration this is was a highly modified ( Heads/cam/intakes/nitrous etc) LS1....Now as an active member on many LSX forums I can tell you the majority of stock LSX motors are on 5-30 synthetics.....and I would support a good 30 weight on a stock LSX motor....now the thicker 30's seem to be producing the less noise/better gas mileage/performance ( Butt dyno)...GC/Amsoil/Royal Purple being the most widely used 0-30/5-30 in these motors....
I am a fan of VSOT for sure....a oz to a quart will hurt nothing and will thicken a tad and provide a good dose of Moly to boot....I would challenge anyone to show me where that would harm anything....quite the opposite....
And I would be remiss if I failed to mention my strong support of these forums that provide a wealth of experience and knowledge....yes one must turn on his/her "internet filter" but I find those posting ridiculous " experience or findings" are quickly exposed and dismissed by and large....
Michael feel confident in recommending to your friend to go with a Mobil 1 5-30/VSOT fill....and drive careful!

 

[cptok]

I have the LS2 GTO as well (and am a long time lurker on BITOG). The GTO spec calls for GM4718M (not Mobil 1 specific - that would be silly). I happen to use PP 10/30 which IS GM4718M spec'd as are many other 5w/30 and 10w/30 oils. There should be no warranty issue using them.

Additives however, as originally asked, are another issue entirely. Personally, I wouldn't do it (with or without the warranty issue).

PS - sgtgeek's advice always worth reading...

 

[sprintman]

What do you guys with GTO's think of your Holden Monaro (oops GTO)??

 

[Jason8691]

Sprintman:
Its a great car, solid ride - not all creaky like most American made cars. High speed handling is great, in mine 140 is as smooth as 75. Another example of American muscle in a foreign made body that turned out to be a good idea.

 

[sgtgeek]

quote:

---

Originally posted by sprintman:
What do you guys with GTO's think of your Holden Monaro (oops GTO)??

---

**** fine quality...I wish my 65 GTO had a fraction of the comfort and quality my 04 has...what do you think of the LSX series American Muscle?

 

[sprintman]

What is LSX Series American Muscle?

 

[sgtgeek]

The LS1/LS2/LS6/LS7 engines under the hood

 

[sprintman]

We get LS1/LS2 which we upgrade and Ford 5.4 which we rebuild with better locally made internals and the 4 valve Ford heads on the Falcon GT/GTP which at release had notbeen used on any U.S made Ford. 400HP but LS2 has more torque of course.

 

[sgtgeek]

Yup...I've been there...you guys are gearheads for sure
By the way....settle something for me....A buddy of mine is a mechanic at Kingsford Smith Airport in Sidney and we get together from time to time for a beer and lie to each other....what weight of oil is GM telling folks to put in their LS1/2's there?

 

[toyota62]

Mobil1 10w-30 for high performance models (HSV range).For general use any 10w-30 GF3 rated engine oil.

 

[sgtgeek]

I hang out from time to time on the Australian Holden boards to learn the "old" tricks on the Holden Manaro's.....the majority on there use 15-40 or 20-50 in the LS1/2's....I was curious....even 10-30 is "thicker" than what is recommended here in the states.....5-30 is the soup GM pushes here....does lead one to believe in the EPA/CAFE driven weight recommendations as these are the exact same engines and Australian weather aint all that different than Texas weather is it

 

[Ryan00TJ]

My 420rwhp H/C LS1 SS shows it's best UOA results on 40w oils. Car is daily driven and also raced 20-50 times a year down the track. Best results were on Schaeffer 15W-40 Blend. Currently running last of my Schaeffer 10W-30 in it and will be doing a UOA this summer. Oil already has 8 passes on it.