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post #1 of 109 Old 08-10-2015, 12:25 PM Thread Starter
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0W-20 oil?

The owner's manual on my Accord V6 recommends 0W-20 oil.

Is this a strictly synthetic oil or is it a synthetic/conventional oil blend?

That oil is so thin and I'd rather use a slightly thicker oil like 5W-20 or 5W-30. Will this hurt the engine?

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post #2 of 109 Old 08-10-2015, 12:33 PM
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Just use 0w-20. I think the engineers know what they are doing.


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post #3 of 109 Old 08-10-2015, 12:37 PM
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So, you think you know better than the engineers that designed the engine what oil to use? 0w-20 is either full synthetic or a conventional/synthetic blend, and since it's what the manufacturer specifies, why would you use anything else?

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post #4 of 109 Old 08-10-2015, 12:39 PM
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Most manufacturers have been moving from 5W30 to 5W20 and now 0W20.. this helps them meet fuel economy standards set by government authorities.

For my TSX and Venza I put 5w30 even though Acura suggested I can run 5w20 oil... my new accord is rated at 0w20 so that's what I will put to avoid warranty issues.

I would suggest you do the same while during warranty. Outside its up to you if you want to run thicker oil.... but at least for cars that come from the factory with a specific oil grade I always stick with that.

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post #5 of 109 Old 08-10-2015, 12:44 PM
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Quote:
Originally Posted by longhornaccord View Post
The owner's manual on my Accord V6 recommends 0W-20 oil.

Is this a strictly synthetic oil or is it a synthetic/conventional oil blend?

That oil is so thin and I'd rather use a slightly thicker oil like 5W-20 or 5W-30. Will this hurt the engine?
Honda appears to be allowing 0w20 on some older cars for which 5w20 was the original spec:


I say "appears to be" because while you can find that chart on a lot of dealer sites, I've yet to find it on the Honda corporate site.

I'd also like to know what "acceptable" means in the chart. Is 0w20 preferred for my 7th gen, or just allowed?

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post #6 of 109 Old 08-10-2015, 12:51 PM
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I believe 0w20 and 5w20 are more interchangeable than say, 5w30 or so... I buy the Mobile1 0w20 at Walmart - it's 21.99 for 5qts and is a very decent oil.

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post #7 of 109 Old 08-10-2015, 01:04 PM
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I would think that the climate you live in might be a reason to consider a SLIGHTLY more (or less) viscous oil. Particularly if you change it seasonally. For example where I live it gets up around 110-115 occasionally, but it pretty much stays in the 100 "neighborhood" for most of July and August. I would think a 5w20 or 5w30 (or even 10w40) would be more beneficial to the internal parts of my motor during those months. Heck I used to run 20w50 Castrol in my old Mitsubishi pickup during the summer months and it did great! I'll have to ask Honda service when it goes in but it seems short-sighted of Honda to basically REQUIRE one weight of oil for everyone regardless of climate and use.
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post #8 of 109 Old 08-10-2015, 01:20 PM
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Your engine runs at about the boiling point of water (212F), actually a little hotter. The exception is under very hard use (say, at a track), when the oil temp can outrun the coolant temp. So, once warmed-up, your engine is at the same temp on a 10F winter day as it is on a 110F summer day. (Before it's warmed-up, extreme cold can be a problem.) Hot summer days put your cooling system under duress, but as long as your car isn't overheating you should be OK w.r.t. oil.

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post #9 of 109 Old 08-10-2015, 01:34 PM
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My last oil change I took 5W20 oil to the dealer and they didn't tell me anything voiding my warranty or none of that.

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post #10 of 109 Old 08-10-2015, 01:49 PM
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Quote:
Originally Posted by longhornaccord View Post
[...] I'd rather use a slightly thicker oil like 5W-20 or 5W-30. Will this hurt the engine?
I wonder if the design engineers can even answer that question.

I imagine that a decision on what oil to use is made early on, and then new components of the engine system are designed with that choice in mind. Components inherited from older engine designs are evaluated and modified if necessary for the thinner oil. Most importantly, testing is done only with the specified oil. So is 5w30 OK? Who knows? Some components weren't designed with it in mind, and no significant amount of testing was done with it. (All this is a presumption, of course, I wasn't there.)

Your engine was designed, and tested, with 0w20 in mind. I'd be inclined to use it.

Edit: GM seems rather adamant about it (note, dexos is a GM spec):
from

Question: If dexos1™ 0W20 oil is recommended for my vehicle’s engine, do I have to use it?

Answer: Yes. As an example, the 5.3L and 6.2L V8 EcoTec3 engines available in the 2014 Silverado 1500 and Sierra 1500 pickup trucks, were designed, engineered, validated and EPA certified using dexos1™ 0W20 oil. This is the ONLY oil approved for these engines.

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post #11 of 109 Old 08-10-2015, 02:18 PM
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If you change oil yourself, and use Mobil 1 for example, they are all the same price at Walmart so why open up a can of worms just stay with the 0w-20 unless you can find something from Honda that states otherwise. They know better than we do. If you have extra stock lying around of 5w-20 or 5w-30 I don't think that you are going to hurt anything by dumping it in the crank case.

A few years back, on the ATF front, DW1 replaced Z1, I believe that DW1 was a more viscous. It's all about MPG's these days.

It was also ok to use 0w-20 oil in Hondas that required 5w-20 a few years back.
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post #12 of 109 Old 08-10-2015, 04:19 PM
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Owner's manuals used to have a list of different oil weights i.e. 5W20, 5W30, 10W30, etc. and you could take your choice depending on the climate and conditions you expected.

But a few years back the EPA dictated that the only oil weight that could be recommended to the customer was the oil weight used for the emission control and fuel mileage tests. So now we have only one choice, 0w20 because it can improve mileage by a fractional amount and all those tiny fractions add up when the CAFE mileage is computed. Of course after the power train warranty has expired you are free to use anything you choose.

I used 0W20 in my previous car, a Toyota, for 5 years and over 80K miles under some fairly severe conditions and had no problems.

Here is some interesting Information from the Ferrari forum (no I don't own one). There is some good information here that you probably won't find on Bob's the Oil Guy:
StevieD and greyhonda like this.

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post #13 of 109 Old 08-10-2015, 04:59 PM
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Read this thread too. there is some good info in it and a few good links.
Is it okay to run OW-20 all year round?

Being in Texas, the difference between 0W and 5W doesn't apply. You never see the temperatures that these two numbers are designed for.

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post #14 of 109 Old 08-10-2015, 05:10 PM
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5W-30 is the recommended weight in the Middle East, so there's so logic to running it in a ultra hot climate (PHX probably applies but I run 0W20 anyways). I'll probably switch to 5-30 when I go boost.

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post #15 of 109 Old 08-10-2015, 05:59 PM
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Quote:
Originally Posted by TN9thSi View Post
So, you think you know better than the engineers that designed the engine what oil to use? 0w-20 is either full synthetic or a conventional/synthetic blend, and since it's what the manufacturer specifies, why would you use anything else?
Unfortunately the weight of the oil doesn't always come from the engineers. I'm pretty sure early 2000's Honda Odyssey's called for 5w20 in the U.S. Owner's Manual and 5w30 in the Canadian owner's manual ( especially suspect since warmer climates usually require thicker oil, not vice-versa). I certainly wouldn't put 20w50 in there, but I'd bet going one increment in either direction such as 5w20 synthetic wouldn't hurt anything.


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