Recent Topics
International news - India
by Rick in PA
02/22/17 03:27 AM
Penrite 5W-20 & 15W-60 in Oz
by SR5
02/22/17 01:57 AM
YOUR eds red?
by buck91
02/21/17 11:53 PM
K&n open element
by buck91
02/21/17 11:49 PM
Wilson branded alternators? any good?
by Mr_Accord
02/21/17 10:59 PM
2013 Civic low speed hesitation
by Dohc98vteC
02/21/17 10:36 PM
Letís discuss high mileage modern engine life...
by Owenslee
02/21/17 09:40 PM
Sunoco about to join the Top Tier List
by Tdbo
02/21/17 09:34 PM
Blower + mods require higher end oil?
by c5z06
02/21/17 09:01 PM
ball joints
by mobilaltima
02/21/17 08:34 PM
Racor Pff54529
by BrianF
02/21/17 08:24 PM
Semi load of corvettes
by 04SE
02/21/17 08:16 PM
Vinyl repair
by mjoekingz28
02/21/17 08:05 PM
2000 Dodge Caravan won't start and no fuel pressure?
by Rock_Hudstone
02/21/17 08:02 PM
Homemade additive?
by Birdman476
02/21/17 07:42 PM
Castrol Edge Gold 5w30 A3/B4 - any info on this?
by slacktide_bitog
02/21/17 07:40 PM
$38 free for opening my mail (Nielsen TV survey)
by 04SE
02/21/17 07:19 PM
New 2016 Grand Caravan 3.6 question
by otis24
02/21/17 07:09 PM
Autolite spark plugs
by Camprunner
02/21/17 07:08 PM
Castrol/Edge 0W-40 At Walmart
by zmelli
02/21/17 06:44 PM
Newest Members
Ozlander, JamD, Neiding, akblackfoot, housekpacu
60603 Registered Users
Who's Online
23 registered (car51, carviewsonic, 1foxracing, czbrian, Astro_Guy, bbhero, 4 invisible), 1115 Guests and 13 Spiders online.
Key: Admin, Global Mod, Mod
Forum Stats
60603 Members
66 Forums
261401 Topics
4311884 Posts

Max Online: 3590 @ 01/24/17 08:07 PM
Donate to BITOG
Page 1 of 2 1 2 >
Topic Options
#1088617 - 02/18/08 04:53 PM 5W20 VS. 5W30 VS. 10W30
byez Offline


Registered: 10/21/07
Posts: 434
Loc: Canada,North America,Western H...
Considering what to run in my 03 V6 Toyota Highlander which is a non-sludge year engine.

With my limited oil knowledge, correct me if i am wrong but the 5w20 will have the best fuel economy and cold starts and the 10w30 will have the best thermal stability. So would a 5w30 be the best of both worlds? The engine in question has been ok'd by Toyota for 5w20 use.

Top
#1088627 - 02/18/08 05:00 PM Re: 5W20 VS. 5W30 VS. 10W30 [Re: byez]
MGregoir Offline


Registered: 08/30/07
Posts: 1784
Loc: Bonnyville, AB
5W-20 offers an increase in fuel economy and to this point have shown to be pretty good oils, plus they offer better low temperature performance.

5W-30 offers good cold weather performance and good high temperature protection to an extent but have not shown to be notably better than 5W-20 oils in applications where 5W-20 is reccomended.

10W-30 offers the best high temperature performance, but at a significant cold weather performance penalty and to an extent startup wear penalty from what I have heard.

If it is spec'd for 5W-20 just use 5W-20, if for 5W-30 use 5W-30. I wouldn't use 10W-30 except in the summers in most of Canada.

Top
#1088633 - 02/18/08 05:13 PM Re: 5W20 VS. 5W30 VS. 10W30 [Re: MGregoir]
ekpolk Offline
The Regenerator


Registered: 04/05/04
Posts: 8881
Loc: Pensacola FL
I'd go with MG's comments on this, with the following thoughts. Over the years here, I've become convinced that each of us have enough unique facts in our usage patterns that general advice is good only as a starting point. To take it to the n-th degree, you'll have to do several UOAs to see how your oil choices perform in your environment, under your usage conditions. You might try a few different oils, and see how they do for you, with the OEM recommendations as a starting point. Be patient, and let us know how it works out if you decide to try this path.
_________________________
09 Camry Hybrid, Black (M1 5w-20, std flavor).
07 Avalon XLS, Cassis Pearl (GC 0w-30).
04 Prius, Black (GC -- 0w-30).

Top
#1088639 - 02/18/08 05:21 PM Re: 5W20 VS. 5W30 VS. 10W30 [Re: ekpolk]
02zx9r Offline


Registered: 07/05/07
Posts: 3205
Loc: Ball, LA
_________________________
2012 Honda Insight EX





Top
#1088644 - 02/18/08 05:28 PM Re: 5W20 VS. 5W30 VS. 10W30 [Re: 02zx9r]
byez Offline


Registered: 10/21/07
Posts: 434
Loc: Canada,North America,Western H...
So according to this chart. Would 5w30 and 10w30 be identical when it comes to summer performance and the only clear advantage would be 5w30 in the winter?

As the chart does not contain 5w20, would the maximum temp range be in the 25c to 30c range?

Top
#1088653 - 02/18/08 05:34 PM Re: 5W20 VS. 5W30 VS. 10W30 [Re: byez]
Titan Offline


Registered: 10/04/05
Posts: 2331
Loc: Charlotte Metro area
 Originally Posted By: byez
So according to this chart. Would 5w30 and 10w30 be identical when it comes to summer performance and the only clear advantage would be 5w30 in the winter?

As the chart does not contain 5w20, would the maximum temp range be in the 25c to 30c range?



My take is that 5w30 always has the advantage over 10w30, unless your engine shears oil alot, or has very few cold starts...by, cold, I mean anything significantly less than operating temperature....
_________________________
The terms "dino,synthetic,blend,conventional" are marketing terms; not scientific terms.

Top
#1088655 - 02/18/08 05:35 PM Re: 5W20 VS. 5W30 VS. 10W30 [Re: 02zx9r]
bamorris2 Offline


Registered: 06/21/07
Posts: 127
Loc: California
 Originally Posted By: 02zx9r


Sorry, but I think that graph is meaningless. My truck is spec'd for 5w20 in all weather. But according to that graph, I should be running straight 40 weight..??.. (yes, my temps are petty much +50*F all year).

Top
#1088656 - 02/18/08 05:36 PM Re: 5W20 VS. 5W30 VS. 10W30 [Re: byez]
MGregoir Offline


Registered: 08/30/07
Posts: 1784
Loc: Bonnyville, AB
Your engine has a thermostat to try to keep it close to the same temperature all the time when it is operating, roughly 195 degrees Fahrenheit, and it will only exceed that when the radiator's cooling capacity is exceeded. Typically 30 weight oil is at about 13 cSt at that temperature, and 20 weight oil is about 10.5 for viscosity.

The thinner oil is made up for by increased oil flow as well, and in most conditions 5W-20 is acceptable.

If you tow, or your engine regularly runs higher temperatures, you may require the additional protection of a 30 weight, and if the engine is specified for a 5W-30 oil (which it most likely is) it is the safest bet for all season performance.

Top
#1088675 - 02/18/08 06:15 PM Re: 5W20 VS. 5W30 VS. 10W30 [Re: MGregoir]
02zx9r Offline


Registered: 07/05/07
Posts: 3205
Loc: Ball, LA
the chart is somewhat old but is the only one I have at this time. If anyone has an updated one i would like to see it
_________________________
2012 Honda Insight EX





Top
#1088679 - 02/18/08 06:17 PM Re: 5W20 VS. 5W30 VS. 10W30 [Re: 02zx9r]
02zx9r Offline


Registered: 07/05/07
Posts: 3205
Loc: Ball, LA
I forget who it is either patman or gman that is running straight 30 weight in his 300M, no problems. Wont shear as much as the multi-weights
_________________________
2012 Honda Insight EX





Top
#1088752 - 02/18/08 07:40 PM Re: 5W20 VS. 5W30 VS. 10W30 [Re: 02zx9r]
byez Offline


Registered: 10/21/07
Posts: 434
Loc: Canada,North America,Western H...
So what would be the most robust oil in long drain intervals? A 5w30 will shear to a 5w20, so what will a 10w30 or even a 5w20 shear to under long oci's?

Top
#1088756 - 02/18/08 07:52 PM Re: 5W20 VS. 5W30 VS. 10W30 [Re: byez]
slipperysam Offline


Registered: 12/25/07
Posts: 102
Loc: rochester,ny
I agree that these generic oil temp charts are basically junk.
If you look at the chart suppplied by your auto manufacturer,
you will see what oils to use for given temp ranges. These can be found in your owners manual and are spec'd for conventional oil. They typically recc one grade but allow others under certain circumstances. Buy the cheapest brand name you can find that correlates with your expected temp range and change it according to the manual. Very simple really .

SS


Edited by slipperysam (02/18/08 07:58 PM)

Top
#1088761 - 02/18/08 08:03 PM Re: 5W20 VS. 5W30 VS. 10W30 [Re: slipperysam]
02zx9r Offline


Registered: 07/05/07
Posts: 3205
Loc: Ball, LA
just posted the chart so you can get a general idea of what temps the oil grades are good at
_________________________
2012 Honda Insight EX





Top
#1088766 - 02/18/08 08:06 PM Re: 5W20 VS. 5W30 VS. 10W30 [Re: slipperysam]
Panzerman Offline


Registered: 12/16/06
Posts: 3392
Loc: Port Orange, Florida
I would take the 10w30 as the most robust oil, the closer you keep the numbers, 10 to 30, 5 to 30, 5 to 20, the less modifiers and better protection aginst shearing. 10w30 is all of a sudden, in the last couple of years labeled a gear oil by most. I would guess 70% of the cars on the road are running on 10w30, no matter what they are spec'd on. All the quick lubes run this as well as alot of home mechanics. So far all the super high milelage cars( a million miles) have been on thicker oils such as 10w30 or 20w50. Neither a 5w20 or a 10w30 is going to cause overnight failure in any engine. That said in my opinion, 10w30 is still the best choice for any and all cars.
_________________________
2007 Ford F-150 FX-2 79,000
2007 Ford F-150 FX-4 212,000 (Sold to the Son).
2006 Dodge Ram 2500 Sport 4x4 75,000
2002 Lincoln Continental 159,000

Top
#1088774 - 02/18/08 08:16 PM Re: 5W20 VS. 5W30 VS. 10W30 [Re: Panzerman]
slipperysam Offline


Registered: 12/25/07
Posts: 102
Loc: rochester,ny
Generally speaking Pman is right. Unless your manual states otherwise you can probably use 10w-30 in any engine and be ok.
I consider it to be the default oil when unsure of what to use.
My Honda manual says I can use 10w-30 down to 20F, however it says 5w-30 can be use year round for all temps. So I use the 5w-30 because the winters here can see temps down to 0F. I realize that 10w oils are good down to 0F, however I want the faster lube provided by 5W in the lower temps. I would have no issues running 10w-30 in the summer however.

SS

Top
Page 1 of 2 1 2 >