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The original XL-7500 was a true base iv synthetic. Sometime around 2003 is when they switched it to base iii. Originally Posted By: buster MaxLife is a syn blend Why on earth would I want to use an inferior synthetic-natural blend rather than the true OE synthetic for only 60 cents more?

VW actually tests the oil to make sure it passes (they want to make sure the camshafts are protected from the high pressure pumps). GM doesn't test the oil, but just verifies you are using 1 of 4 additive packs.

Originally Posted By: OVERKILL Why do you think people (and the oil companies) were so opposed to it? I don't know but I suspected it was the Same reason they were opposed to 0w-20 or 5w-20 back in 2001, 2, 3. Or why even now some refuse to use VW504-certified in their new cars. They oppose new...

Originally Posted By: Boomer Why would we think that is typical of current formulations? I never said you should think that.

iF YOU'RE CURIOUS ABOUT THE FACTORY FILL take a look at this. This is a copy-n-paste from a different forum. QUOTE: "I recently changed my oil for the first time on my new Insight and sent a sample of the original oil to Blackstone Laboratories for analysis. Here is the information from there...

Originally Posted By: OVERKILL Quote: So GM is just doing what other Euro and Japanese companies have done since the 90s. Nobody is balking at GM's certifications. GM had a number of certifications PRIOR to DEXOS. The issue is with the royalties GM charges. What royalties? I'd like to see a...

Originally Posted By: dave1251 To be honest I do not really care about GM'S DEXOS spec it makes GM look like GM is using oil companies as another revenue source. What Gm is doing is nothing new. Globally companies have been "certifying" oils for awhile. Volkswagen specifies that owners should...

Yeah it's official. I'm surprised they didn't say somewhere "This is an official General Motors website," so we'd know it's the real thing and not some Nigerian owned scamsite. ;-) This also tells me it's safe to use Pennzoil Synthetic (though I don't understand why they don't have the green...

I just figured the viscosity of the oil is a bigger factor in Fuel economy than the oil shear between two metal surfaces. If I were picking an "ideal" oil I would want the thinnest 100C viscosity possible, but with high HTHS values to prevent wear.

Originally Posted By: LineArrayNut How's that analysis workin' out for ya' there, chief? Coulda used the money for an OC and been doin' a bit better, eh? Dear Mr. Vain: First off: Who cares? The 87 Plymouth was inherited from my mother. It was a nice-looking car but it ran like crat (bounced up...

" it was clarified that fuel economy is high even when the HTHS viscosity is in the ultra-low region of 2.1 mPa·s." It sounds like if you go too low with HTHS, metal on metal contact will decrease fuel economy. And that CCS viscosity matters more.

A full synthetic that is dexos-certified and less than 4 dollars? Find that hard to believe. Can I use the MaxLife in a brand new car?

Uh.... so they renamed the XL oil to OE?

Originally Posted By: Falken Roger, QSUD and Pennzoil Platinum are both Sopus/Shell. Good info! Antiwear is more important than cleaning since the station wagon is brand new.

Originally Posted By: Falken I'd go for QSUD if it is Dexos. That means better base stocks and lower Flash Point. You dislike Pennzoil synthetic? BTW the Quakerstate is handing-out $20 rebates for QSUD. I applied for mine. And their oil says "exceeds dexos" not that it is certified by GM. :-(...

http://www.gmdexos.com/licensedbrands/dexos1licensedbrands.html Center for Quality Assurance = So who are these people annd why should I trust them to provide accurate information about Dexos certification? Pennzoil Synthetic's website say nothing about dexos cerification.

Does it exist? I didn't see any at the walmart. Maybe I'll go with the Quaker State synthetic instead (it has the green dexos symbol on it).

So it's probably doing the same on the bottom of your oil sump.

Cool I've been wondering how those 3-cylinder high stress engines were holding up in the funny-looking cars. Looks like they work just fine (except for the moly rubbing oil the pistons)(not good). The XL worked well too. Originally Posted By: buster I'll say this though, your better off buying...

I've been running XL-7500 oil. Did I hear correctly that Amsoil renamed it OE (original equipment)?