From 10W40 to 0W30 - Page 2 - Fuelly Forums

Click here to see important news regarding the aCar App

Reply
 
Thread Tools Display Modes
 
Old 12-02-2009, 02:07 PM   #11
Registered Member
 
i-DSi's Avatar
 
Join Date: Nov 2009
Posts: 179
Country: United States
Quote:
Originally Posted by theholycow View Post
My understanding was the opposite, that thicker oil is more difficult to pump but in a worn engine with larger clearances the thicker oil would be better lubrication...while thinner oil is easier to pump everywhere quicker, and gets into tighter clearances better.
Hi Holy cow,
This all depends on the manufacturer of the engine. If 0W20 is allowed, this means that with this oil in all circumstances there will be enough pressure left.
My Civic can take 0W20 and at next oil change I will put it in.
Pay attention to what you call a 'worn engine'. In my understanding that's an engine where the clearance between pistons and cylinders is to big. If in your understanding a worn engine is one where the clearances in the bearings are bigger, that's another story. You should find out where pressure is lost.
__________________

i-DSi is offline   Reply With Quote
Old 12-02-2009, 02:49 PM   #12
Site Team
 
Join Date: Dec 2006
Posts: 658
Country: United States
I don't see how worn cylinders will affect oil pressure. The blowby might affect crankcase pressure, and more oil might be burned, but the pistons do not receive directly-fed oil as far as I know...

-BC
__________________

__________________
Think you are saving gas? Prove it by starting a Gas Log, then conduct a proper experiment.
bobc455 is offline   Reply With Quote
Old 12-03-2009, 12:39 AM   #13
Registered Member
 
i-DSi's Avatar
 
Join Date: Nov 2009
Posts: 179
Country: United States
Quote:
Originally Posted by bobc455 View Post
I don't see how worn cylinders will affect oil pressure. The blowby might affect crankcase pressure, and more oil might be burned, but the pistons do not receive directly-fed oil as far as I know...

-BC
Oh no Bob, I didn't mean you will loose pressure when pistons/cylinders are worn.
I meant that you will consume some oil with thinner oil when pistons/cylinders are worn, because the bottom oil piston ring will not be able to do his work anymore.
i-DSi is offline   Reply With Quote
Old 12-03-2009, 06:17 AM   #14
Registered Member
 
Join Date: Nov 2007
Posts: 1,111
Country: United States
Send a message via AIM to dkjones96
Quote:
Originally Posted by theholycow View Post
My understanding was the opposite, that thicker oil is more difficult to pump but in a worn engine with larger clearances the thicker oil would be better lubrication...while thinner oil is easier to pump everywhere quicker, and gets into tighter clearances better.
That's right... Thicker oil is more difficult to pump through small openings so you end up with more pressure than the same engine running a thinner oil. As bearings open up pressure with the same viscosity will fall.

The difference between 0 and 10 will be almost nothing as far as engine protection is concerned although you may notice a performance increase. You're talking about when the engine is cold and even 0 weight is thicker in a cold engine than 50 weight in a hot engine. I noticed it in the Tracker but am pretty sure I wouldn't in the Durango as I don't even notice the AC cycling in that thing.
__________________
- Kyle
dkjones96 is offline   Reply With Quote
Old 12-03-2009, 07:09 AM   #15
Registered Member
 
i-DSi's Avatar
 
Join Date: Nov 2009
Posts: 179
Country: United States
Quote:
Originally Posted by dkjones96 View Post
That's right... Thicker oil is more difficult to pump through small openings so you end up with more pressure than the same engine running a thinner oil. As bearings open up pressure with the same viscosity will fall.

The difference between 0 and 10 will be almost nothing as far as engine protection is concerned although you may notice a performance increase. You're talking about when the engine is cold and even 0 weight is thicker in a cold engine than 50 weight in a hot engine. I noticed it in the Tracker but am pretty sure I wouldn't in the Durango as I don't even notice the AC cycling in that thing.
Well, Jones, I picked the '0WX' because with lower cold resistance the oil will always be pumped quicker around the entire engine than a '10WX'-oil. That's where the difference in protection should be, especially with this car that's always driven cold. In these circumstances there's a risk that the (OH-)camshaft receives very late or insufficient lubrication time after time.
Her previous car started consuming some oil after approx. 50Kmiles, same bad circumstances. Now that the warranty period is over I can put in it what I want: only the best for our conditions, within the manufacturers margin. I don't want this car to see consuming oil so quick.
i-DSi is offline   Reply With Quote
Old 12-03-2009, 07:35 AM   #16
Registered Member
 
Join Date: Nov 2007
Posts: 1,111
Country: United States
Send a message via AIM to dkjones96
A good anti-drainback valve should prevent the oil from draining out of the passages. Since you have an OHC engine I can see it being more of an issue.
__________________
- Kyle
dkjones96 is offline   Reply With Quote
Old 12-03-2009, 08:22 AM   #17
Registered Member
 
DarbyWalters's Avatar
 
Join Date: Oct 2007
Posts: 376
Country: United States
The viscosity of oil is the HIGHER NUMBER so a 0W-30 has the same viscosity of a 10W-30. It is not thinner. The "W" stands for "Winter" to signify how it flows at lower temps.

20W good to 32 degrees F
15W good to 14 degrees F
5W good to 0 degrees F
0W good below 0 degrees F

(degrees from memory, but you get the idea)
__________________
2006 Jeep Liberty CRD...Founder of L.O.S.T.
OME 2.25" Lift w/ Toyo Open Country HTs 235/75/16s
ASFIR Alum Eng/Tranny/Transfercase/Fuel Skids
2002 Air Box Mod...Air Tabs (5) on Roof...(3)each behind rear windows
Partial Grill Block with Custom Air Scoop and 3" Open Catback Exhaust
Lambretta UNO150cc 4 Stroke Scooter



DarbyWalters is offline   Reply With Quote
Old 12-03-2009, 08:36 AM   #18
Registered Member
 
theholycow's Avatar
 
Join Date: Apr 2008
Posts: 6,624
Country: United States
Send a message via ICQ to theholycow Send a message via AIM to theholycow Send a message via MSN to theholycow Send a message via Yahoo to theholycow
Thickness is approximately the same as viscosity in these discussions.

As for the ratings...It's multi-viscosity. The number before the W is its viscosity rating in low temperatures. The number after the W is its viscosity rating once it's warmed up.

I could go on, but here's a link where somebody wrote it accurately and succinctly:
http://www.repairfaq.org/filipg/AUTO/F_oil_facts.html
__________________
This sig may return, some day.
theholycow is offline   Reply With Quote
Old 12-03-2009, 09:24 AM   #19
Registered Member
 
Join Date: Nov 2007
Posts: 1,852
Country: United States
Location: north east PA
Both numbers are a measure of viscosity, or at least a standard labeling system corresponding to viscosity. Manufacturers should post actual measurements for viscosity under product specs. THC's Castrol falls in the 30 range, but is at the high end, close to 40.

Apparently, 'cold' viscosity testing is done at 40C. For the Celsius challenged, that's 104F. Publish results for Mobil1 10w30, 5w30, and 0w30 are really close, but I wonder how much they'll diverge under real world cold temps.

I've heard that 0w isn't possible with dino oil. So, if you want a true group IV synthetic, or least higher percentage of it, grab the 0w.
trollbait is offline   Reply With Quote
Old 12-03-2009, 09:44 AM   #20
Registered Member
 
i-DSi's Avatar
 
Join Date: Nov 2009
Posts: 179
Country: United States
Quote:
Originally Posted by DarbyWalters View Post
The viscosity of oil is the HIGHER NUMBER so a 0W-30 has the same viscosity of a 10W-30. It is not thinner. The "W" stands for "Winter" to signify how it flows at lower temps.

20W good to 32 degrees F
15W good to 14 degrees F
5W good to 0 degrees F
0W good below 0 degrees F

(degrees from memory, but you get the idea)
Yes Darby, thanks, but nobody ever doubted this? I can only confirm.
__________________

i-DSi is offline   Reply With Quote
Reply

Thread Tools
Display Modes

Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off
Trackbacks are Off
Pingbacks are Off
Refbacks are Off


Similar Threads
Thread Thread Starter Forum Replies Last Post
Picked up a new HF opelgt73 Introduce Yourself - New member Welcome 26 09-12-2008 11:04 AM
Should I enter a discounted price? VVV Fuelly Web Support and Community News 2 09-02-2008 09:59 AM
A RAV4 to go with the Prius? krousdb General Discussion (Off-Topic) 31 12-30-2006 04:32 AM

» Fuelly iOS Apps
No Threads to Display.
Powered by vBadvanced CMPS v3.2.3


All times are GMT -8. The time now is 07:57 PM.


Powered by vBulletin® Version 3.8.8 Beta 1
Copyright ©2000 - 2024, vBulletin Solutions, Inc.