2011 GM vehicles.

[nodoze]

technically drum brakes are far more effective for braking then discs due to more surface area being applied at once, hence why alot of big trucks still use them. drums are just not as good at dissapating heat

[NotMaiCar]

I dont see a huge problem, you get triple the miles and 30% increase in price and a tiny bit of mileage...

Its industry standard, its iffy but not like Intel trying ot force Rambus on us evil...

Well personally, I wouldn't let a Honda Civic go ten thousand miles between oil changes.

And I actually just remembered this, my dealership has a contract with enterprise rent-a-car, just as alot of dealerships do. And they come to us for oil changes. They don't use any special oils at all. I mean no dexOS, no full synthetics, just mobil bulk conventional oil. They usually have a car in service for 2-3 years. I haven't heard a peep about their engines crapping out or seeing any ill effects from not following the manufacturer's guidelines. So i highly doubt it can actually damage the engine.

As far as the LS3 goes, i know for a fact they haven't changed internals or anything on them. I talk to the service mechanics all the time and they've said the oil is just another way for GM to cover their losses, and get as much money after the sale as they can. Seeing as how the dexOS oil is made by ACDelco, it makes sense.

With the salesmen selling you a car without ever telling you about this requirement, I can see a few legal battles coming their way.

[Alex3000gt]

technically drum brakes are far more effective for braking then discs due to more surface area being applied at once, hence why alot of big trucks still use them. drums are just not as good at dissapating heat

I'll get on the phone with every motorsport in existence and let them know they are doing it wrong.

[RealMcCoy]

What's the big deal...? This is nothing new. EVERY manufacturer has proprietary oil specifications. It allows them to control the testing of approved oils, control the warranty liability for not using approved oils, and charge the oil manufactures licencing and testing fees to sell approved oil.

It's been pretty much SOP for years...

[Telionis]

I'll get on the phone with every motorsport in existence and let them know they are doing it wrong.

Did you read the entire thing? He didn't say better overall, he said better at one thing. Sort of like a Garand has more hitting power than an M249 - you still wouldn't want the guy with the SAW gunner to be limited to 8 rounds.

[NotMaiCar]

What's the big deal...? This is nothing new. EVERY manufacturer has proprietary oil specifications...

Good point. Lol like [/THREAD].

[RealMcCoy]

The real fun starts when a manufacturer decides it doesn't need an oil spec any more and drops it from use... Anyone notice in the last year or so that you can't buy Dexron III or Mercon ATF anymore?

[stealthee]

The real fun starts when a manufacturer decides it doesn't need an oil spec any more and drops it from use... Anyone notice in the last year or so that you can't buy Dexron III or Mercon ATF anymore?

I just bought Mercon a few weeks ago for a friends car.

[2fnloud]

I wonder what SEMA will do about this? This is kinda like when dealerships tried to tell people that their engine warranty was void because they installed an aftermarket alarm.

OK so they have this specific oil that GM says needs to be used in their engines now...if a consumer doesn't, how does that effect say a blown transmission or an electrical issue with the car? GM will not be allowed to use the "You didn't use our oil, so now your whole bumper to bumper warranty is void."

[stealthee]

Thats part of the Magnusson Moss Act. They will be able to void the warranty on the engine though, which is a crock of shit.