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Hello,
Just went to Walmart to pick up 5-30 oil for my oil change on my '19 GS. All they had was the Mobil 1 "Extended Performance" Dexos full synthetic oil in a 5 qt. container for $27.47. Do I need and is this OK to use or should I just get the Regular 5-30 Dexos at another store?
T.I.A
Rich
As Far as I can tell, the Extended Performance is a better quality oil and I always buy it if I can. But I am not sure what the spec is for your car re: 0W-40? I just changed my oil with the oil you bought and am 100% comfortable. But, I do not track this car and the oil temperatures are always very reasonable.
Probably should use the 0w-40 Mobil1 dexos2 that GM specifies for the'19 GS. It's a little more expensive but can be easily ordered from Amazon, Summit Racing, Rock Auto etc..
Last edited by Kevin A Jones; Nov 21, 2020 at 08:24 PM.
I think I saw in some of Mobil's information that the 0-40 is better for cold start up wear protection and has some other benefits over the 5-30 as well.
After some searching I was able to find the pour point of Mobil 1 (not the ESP variety) listed at -54 degrees C. The 5W-30 Extended Performance is listed as -40 degrees C. This does suggest that the 0W-40 oil would provide better start up protection and of course it would be better for track days.
It appears that the newer 0W-40 ESP is yet another advance in oil technology and I will look for it at the next oil change. But the 5W-30 Mobil 1 oil is still a fantastic oil for street use. Track use is a different matter. I just bought my 2015 Z-51 and the service records from the local Chevy dealer shows that they had been using conventional oil for their oil changes.
I used both 10W-30 Extended Performance and 0W-40 European Formula in my 2014 Mustang GT and over 50+ track events both oils provided extraordinary protection as documented by Blackstone Labs at each oil change. Not the least bit worried about 5W-30 for street use.
Thank you all for your input. This will only be used for street use, so any Mobil 1 5- 30 full synthetic will fit the bill.
Thank you,
Rich
It's all good stuff and the 5-30 was the standard fill until not long ago, so certainly won't hurt anything. The reason that I suggested the 0-40 was your location. I assume it's going to be getting cold soon. Wife grew up a few miles from your general location.
I think I saw in some of Mobil's information that the 0-40 is better for cold start up wear protection and has some other benefits over the 5-30 as well.
But I would still use 5W-30 if I had difficulty getting the new oil or had some other reason where switching was problematic.
I switched my '17 GS from Mobil1 5w-30 to 0w-40 as regardless of how slight the extra cold start protection it's worth the small additional cost to me. Especially since my C7 will stay in the garage over the winter however I will start it up occasionally for a drive on a cold clear day as longs as roads are in good shape.
Average winter low where I live is in the mid-40s to mid-50s.... I could run "dino" oil in mine as long as I didn't flog it.... lubrication is the operative word.
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Extended Performance or Regular
