Does It Really Matter What Brand of Oil I Get? - Chevy Cobalt Forum / Cobalt Reviews / Cobalt SS / Cobalt Parts
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post #1 of 24 (permalink) Old 05-11-2012, 09:25 PM Thread Starter
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Does It Really Matter What Brand of Oil I Get?

Changing the oil by myself and indecisive on what to get. Know it has to be 5W30, and I don't need Synthetic since mine is an LS, but want to get one that is pretty good.

There are just so many, should I get Pennzoil High mileage, Castrol GTX, Mobil Super? (the Mobil says Premium, not Synthetic is that okay?

You guys tell me, I don't know. Online saw a wix filter is best so I'll look for a good one of those.

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post #2 of 24 (permalink) Old 05-11-2012, 09:40 PM
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I usually treat my engine as if its already dirty, even if brand new, GTX High Mileage would be my recommendation. For the Filter, Even a Fram brand one would work, but Wix is apparently better, your choice really, as long as your change your oil before is gets completely dirty, you should be fine.

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post #3 of 24 (permalink) Old 05-11-2012, 11:17 PM
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if you changing your oil every 3k i really dont think it matters what kind of oil you put in. esepcially an LS

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post #4 of 24 (permalink) Old 05-12-2012, 09:32 AM
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I have a friend who was an engineer for Texico/Havoline and basically he said motor oil is motor oil. For 99% of passenger cars, any brand that meets goverment standards will do. He did go on saything that Mobil 1 is probably the best synthetic oil you can use but unless you are running something extremely high performance, it is not necessary.

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post #5 of 24 (permalink) Old 05-12-2012, 10:27 AM
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I ran mobil 1 sythetic in my LT and changed it every 10k miles. the oil suppose to hold until 15k but I just dont feel comfortable going that long without an oil change


I ended up saving money in the long run by switching to synthetic because I went 3x as long between oil changes. I plan on using the same stuff and changing it every 5k in my SS due to it being boosted

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post #6 of 24 (permalink) Old 05-12-2012, 02:36 PM
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The only kind I use is Mobil 1 full synthetic. Has been great and smooth.


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post #7 of 24 (permalink) Old 05-12-2012, 03:14 PM
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If you are going to use full synthetic and keep it in the car for 10,000miles or longer, I would recommend you change the filter half way since it is so easy. Been doing that with my Mitsubishi and it has 379412Kms and still purrs. Been doing it with the Cobalt since I got it. When oil meter says 60% life remaining I change the filter and top-up. Then I change oil and filter at 20% life. About 12000Kms interval.

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post #8 of 24 (permalink) Old 05-12-2012, 06:17 PM
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Still purring, can't argue with that.

What I would do, for the sake of $20, is do as Coby said, but just do the entire oil change "half way". It cant hurt, only help, if you go by the Oil Life info, you generally run for about 4-5 months (regardless of miles, for me anyway) so basically change it every 2500 miles I would guess. The way I see it is, "Change it before it gets nasty, not after." That would require checking oil once a week, when you see it browning, probably about 2 months later (depends on usage), change it.

Unless there is something about only changing the filter I'm missing?

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post #9 of 24 (permalink) Old 05-12-2012, 07:56 PM Thread Starter
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Okay you all have good advice. I'll put the Mobil or GTX high mileage in cause once you start using synthetic can't you not change it?

Ohhhh yeah another thing, the first oil change was complimentary from the dealership, and I waited until the light came on at like 10% then I got it changed. Is it better to automatically change every 3k, or just check the dip to decide when to do it?

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post #10 of 24 (permalink) Old 05-12-2012, 08:02 PM
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I would recommend GTX HM over Mobil, that's just overpriced crap, I purchased it once (on sale) and it did not make any difference. Just change your oil before it gets ugly, then you will see the better end of it later on.

If you use synthetic you can change back when ever you like. If you engine is dirty, or you suspect it is, I would replace 1 of the 5 quarts with Marvel Mystery Oil, it works wonders.

About when to change the oil, I would check using the dip stick every 2 weeks, or every week, once you see it black, change it, filter too.

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