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Is there a dexos approved 15w-50 oil?

10160 Views 23 Replies 7 Participants Last post by  mjw930
Maybe I missed this somewhere but I will ask anyway. GM recommends a 15w-50 oil for "racing" and "performance" driving. I can't find a 15w-50 dexos approved oil. Anyone? Mobile 1 15w-50 is not Dexos approved.
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As you see from GM they recommend Mobil 1 15W50 for the C7 and track use

ExxonMobil today announced a new lubricants technology agreement with General Motors (GM) for the Chevrolet Corvette.

As part of the relationship, Chevrolet has chosen Mobil 1™ motor oil as factory fill for the highly anticipated 2015 Corvette Z06 and the 2014 Corvette Stingray with the Z51 Performance Package.

Building on a 21-year lubricants relationship with ExxonMobil, Chevrolet also named Mobil 1 5W-30, which meets or exceeds GM dexos1® specifications, as the recommended service fill for all Corvette models.

In addition, for on-track and high-performance applications,
Chevrolet is recommending owners use Mobil 1 15W-50 to ensure full engine protection and optimal engine efficiency*.

“It is a testament to ExxonMobil’s commitment to advanced lubricant technology that Chevrolet has chosen Mobil 1 synthetic motor oil for the high-performance Corvette engines,” said David Tsurusaki, strategic global alliance manager, ExxonMobil Fuels & Lubricants.

“As the Corvette Stingray hits roads around the world, we want Corvette owners to know that Mobil 1 motor oil is specifically designed to meet their high-performance demands and will help keep their engines running like new.”

With a factory-fill relationship that began in 1993, ExxonMobil has a legacy of helping Corvette engines perform at their maximum with Mobil 1 lubricant technology.
Mobil 1 motor oils are designed at the molecular level and enhanced with a proprietary additive system to provide outstanding protection against wear, high heat, cold weather and sludge buildup.

In addition to select production Corvettes, Mobil 1 lubricants drive efficiency and power for Corvette Racing’s C7.R in the TUDOR United SportsCar Championship.
With Mobil 1 lubrication technology, the Corvette team competes in some of the most demanding endurance races in the world including the 24 Hours of Le Mans, Rolex 24 at Daytona and the Mobil 1 Twelve Hours of Sebring.
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Dexos approved is mainly for marketing.

Where did you get that ?

Far from it

Due to E10 and last year E15 gas approved GM wanted a top tier gas and engine oil that would assure internals were getting cleaned

Add the issues with GM now with powertrains with DOD, DI and VCT along with supercharged, turbocharged and increased EPA fuel mileage rules GM needed
engine oils better then some snakeoil vendor just saying "meets GM requirements"

Pre dexos1 and dexos2 nameplates went by SAE/API and oil makers who never even bother getting tested by SAE made false marketing claims that their oils "exceeded" that standard so GM wanted to assure no such claim and makes it clear a vendors oils must be GM tested.

It came down to the norm of "standards" where Japan and Europe attempted to drive a new American SAE standard that was biased to those countries oil makeup as both then wanted American vendors to have to pay those 2 countries a fee.

GM said the hell with it and came up with American dexos1 and Europe needs in dexos2

Oil today has to have a makeup to assure nameplates like GM can do 100,000 mile powertrain warranty so a oil design for today's engines had to come about.
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I believe if you live in A hot weather area then I believe that A 50W oil would be good for the cylinders and rings.I do believe that A low weight oil in hot weather isn't good for the engine.I've always believed this.Am I wrong?
Too thin of a oil and in hot weather, engine and track use becomes blowby, through PCV and into the intake where reverb of exhaust can send the oil fumes to aircleaner.
Thin oil flows quicker so it cools down better and gets a bit better MPG

Thicker weight flows slower so it retains more heat, though it reduces blowby and of course bit less MPG

For racing I have always mixed 5W30 and 15W50 Synthetic 50/50 ratio to get like a 10W40 and at races where powertrain is maintained at high RPM, MPH and engine loads like Open Road Racing the thicker oil does a much better job, less oil and blowby issues
Mobil 1 engineering for GM racing themselves told me of the mixing and it does work and the lack of oil use and blowby shows it and not saying to mix brands but same Synthetic Mobil I

If a Corvette is driven on the street as it was designed ( bouncing rev limter, 100% engine loads. etc) for, the thicker grade works as well as if track use.
Under "normal" street driving if means sticking around 2,000 RPMs is one thing but higher loads, higher oil pressure, more flow, more oil cooling and not about outside temp but overall engine/bay temps.

That's all well and good but he never mentioned track use.

Under normal driving conditions the cooling systems maintain the internal temperatures with a certain range regardless the ambient air temp so what you do racing has no bearing on street use.

Oh, and mixing engineered oils to get a target viscosity ratio simply doesn't work the way you describe and in some cases the blend of incompatible additive packages can cause far more harm than good.
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