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Old 12-13-2011, 08:23 AM   #1 (permalink)
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Default What weight engine oil do you use?

I know the Sonata calls for 5w-20w oil but I don't like the fact the engine is only getting the protection of a 20 weight oil. This whole topic was controversial several years ago when manufacturers went to the lighter weight oil (20w) to gain an extremely small improvement in their mpg ratings because the lighter weight oil is supposed to reduce internal engine friction. The controversy is the lighter weight oil shortens engine life.

Personally I prefer the protection of a 30w oil myself and want to use 5w-30w instead. Anyone else have any opinions on this subject?

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Old 12-13-2011, 08:28 AM   #2 (permalink)
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I used 5w20 and 5w30...whatever is in stock during a Quaker State sale. Both are listed as usable weights with our engines.
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Old 12-13-2011, 09:24 AM   #3 (permalink)
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Quote:
Originally Posted by Dave-S View Post
I know the Sonata calls for 5w-20w oil but I don't like the fact the engine is only getting the protection of a 20 weight oil. This whole topic was controversial several years ago when manufacturers went to the lighter weight oil (20w) to gain an extremely small improvement in their mpg ratings because the lighter weight oil is supposed to reduce internal engine friction. The controversy is the lighter weight oil shortens engine life.

Personally I prefer the protection of a 30w oil myself and want to use 5w-30w instead. Anyone else have any opinions on this subject?

Dave
This whole topic is controversial everywhere, including this forum.

I use Mobil 1 5w-30 Extended Performance, which I change with an OEM filter every 7,500 miles. I'm sure my choice is overkill, but it is a good product and a cut above the regular Mobil 1 5w-30.

With bitter Chicago winter temps almost here, I really want to use a 0w-30 product, but Hynudai does not recommend 0w oils.
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Old 12-13-2011, 04:34 PM   #4 (permalink)
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Yes-- ALL oil changes are controversial.

People questioned it when 5w30 came out instead of 10w30. And I'm sure new oil weight changes before that as well.

Unless you have a specific reason to not trust the 20w oil, I don't think you should doubt the protection it provides. But as you've seen, you can run 5w30 if you'd like. I am running 0w20 right now, and feel just fine about it.

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Old 12-14-2011, 02:48 PM   #5 (permalink)
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Quote:
Originally Posted by Klooks Kleek View Post
This whole topic is controversial everywhere, including this forum.

I use Mobil 1 5w-30 Extended Performance, which I change with an OEM filter every 7,500 miles. I'm sure my choice is overkill, but it is a good product and a cut above the regular Mobil 1 5w-30.

With bitter Chicago winter temps almost here, I really want to use a 0w-30 product, but Hynudai does not recommend 0w oils.
the 0w-30 will work fine. The 0 is only on cold start up....once your oil reaches operating temp...it acts as a 30w oil.
On the oil cap it says 5w-20, but in the book it actually states 5w-20, 5w-30.
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Old 12-14-2011, 04:00 PM   #6 (permalink)
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Quote:
Originally Posted by Klooks Kleek View Post
This whole topic is controversial everywhere, including this forum.

I use Mobil 1 5w-30 Extended Performance, which I change with an OEM filter every 7,500 miles. I'm sure my choice is overkill, but it is a good product and a cut above the regular Mobil 1 5w-30.
I use Motul eco-lite 0w-20 in winter and GC in 0W-30 summer every 7500 mile. There isn't overkill when it comes to your ride. I plan to go 10,000 after warranty expires and with extended performance you should too.
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Old 12-14-2011, 05:44 PM   #7 (permalink)
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with the 0w-20 do you see any different on start up or MPG.
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Old 12-14-2011, 05:48 PM   #8 (permalink)
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5w40.
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Old 12-14-2011, 06:21 PM   #9 (permalink)
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the 0w-30 will work fine. The 0 is only on cold start up....once your oil reaches operating temp...it acts as a 30w oil.
On the oil cap it says 5w-20, but in the book it actually states 5w-20, 5w-30.
Thanks, 'geek. I definitely understand the different numbers of oil grading. Odd that Hyundai does not list any 0w oils. You'd think that an oil which is slightly thinner (than 5w) upon cold start would be a good thing. I mean, when it is 0F outside and about 5-10F in my Chicago garage, the oil in my unopened jug of Mobil 1 5w-30 synthetic feels like mud when I shake the container. My wife's Honda Hybrid uses Mobil 1 0w-20 Advanced Fuel Economy and it barely feels any better!

The makers of some 0w oils, like Mobil 1, state that it offers warranty protection for engines that specify 5w oil, but again, Hyundai doesn't seem to agree.
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Old 12-14-2011, 06:26 PM   #10 (permalink)
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I use Motul eco-lite 0w-20 in winter and GC in 0W-30 summer every 7500 mile. There isn't overkill when it comes to your ride.
I agree, dh. I just wanted to acknowledge as I was posting that I'm well aware that once a person gets to a certain level of oil geekery, the differences can probably only be measured by god. Ha!
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