Motor Oil Myths and Facts - Engine Care & Maintenance Forum
Engine Care and Automotive Maintenance Forum Engine Care and Automotive Maintenance Forum

» Auto Insurance
Wheel & Tire Center

Go Back   Engine Care & Maintenance Forum > Engine Care & Maintenance > Engine Lubrication/Oil
Register Home Forums Active Topics Photo Gallery Garage Blogs Search Today's Posts Mark Forums Read Auto EscrowInsurance Advertise

Engine Lubrication/Oil Discuss engine lubrication/oil issues in here.
Sponsored by:Havoline

Engine-Care.com is the premier Engine Care Forum on the internet. Registered Users do not see the above ads.
Reply
 
LinkBack Thread Tools Display Modes
Old 02-15-2008, 04:28 PM   #1 (permalink)
 
Join Date: Feb 2008
Posts: 26
Default Motor Oil Myths and Facts

History

As internal combustion engines for passenger vehicles have been forced to become more fuel efficient, less polluting, smaller, and longer lasting, their lubrication needs have changed dramatically. These changes in the engines have required the development of multi-weight detergent motor oils that are suitable for the tighter clearances, higher heat, and higher RPM of these engines. These oils have additives to reduce wear (especially at start-up), maintain viscosity, and to suspend the soot and contaminants (by-products of combustion) that they wash off the interior engine parts. A side benefit of these oil's ability to maintain viscosity and suspend soot is that the oil change intervals have become longer on most vehicles.

Sludge

The number one reason for oil changes is to prevent the formation of sludge. It's important to understand how sludge forms and how sludge formation is prevented.

How Sludge is Prevented


Additive in the detergent oils 'wash' any contaminant particles off of internal engine parts and hold these particles in suspension until the oil is changed. It's important to understand that these particles are too small to cause engine wear, but they do turn the oil a darker color. The key thing is to change the oil before the oil becomes too saturated with contaminants to hold any more, but color is not an indication of this condition.


How Sludge Forms

As explained above, modern detergent oils suspend contaminants so they do not settle on engine parts and form sludge. When the oil becomes saturated with contaminant particles new particles settle out of the oil onto the internal engine parts and form sludge. This is why it is so critical to perform oil changes before this level of contamination is reached. The only way to know if you're oil needs changing is to have an oil analysis done. Absent this, play it safe and follow the severe service interval specified in the owners manual. Remember that the contaminants come from the combustion process of the gasoline and and the air. Synthetic oil will not prevent these contaminants. Synthetics may be marginally better at suspending more contaminant particles, but not enough to prolong oil changes by much.
Never attempt to clean the inside of your engine with one of those engine flush procedures that many shops try to sell. If you've been diligent about oil changes there will be no sludge. If there is a lot of sludge then the last thing you want to do is to dislodge it all at once.

A good article about sludge can be found at: Toyota Sludge Article


Oil Change Intervals

Few subjects generate as much debate on Usenet as the proper oil change interval. Since few people bother with oil analysis the debate centers on time and mileage.

http://www.nordicgroup.us/oil.htm

El Calor is offline   Reply With Quote
Sponsored Links
Advertisement
 
Old 10-07-2008, 05:48 PM   #2 (permalink)
 
Join Date: Oct 2008
Posts: 13
Default Engine Flush

I'll partially disagree with the part about engine flushes. An engine flush is usually recommended whenever the oil hasn't been changed on time based on mileage OR time. I would recommend that as long as the oil changes are normally regular and the most recent oil change was overdue. Also, about every 15,000 miles (or every FIVE oil changes).
I'll agree not to use it in the case that the oil change history is unknown, and/or the engine has a lot of miles on it. Once regular oil changes are performed on the vehicle again (about five without going overdue), and you have verified that there is little to no oil consumption, an engine flush is perfectly fine to perform. An engine that is cleaner on the INSIDE will pollute less on the OUTSIDE. In most cases, if its cleaner on the inside, it also runs more efficiently. For the higher mileage engines, maybe use an oil that will also recondition seals and gaskets and prevent/reduce leaks, burning, and consumption.

Phil
phillyb is offline   Reply With Quote
Old 01-30-2009, 02:25 AM   #3 (permalink)
Junior Member
 
Join Date: Jan 2009
Posts: 6
Default

I agree with phillyb. Engine flushes are only recommended when you have neglected regular oil change for some time.

Last edited by jwko; 03-07-2009 at 03:35 AM.
crazydrive is offline   Reply With Quote
 
Old 01-07-2010, 09:43 PM   #4 (permalink)
Junior Member
 
Join Date: Aug 2009
Location: Rock Creek B.C.
Posts: 19
Default

I use a Litre of ATF in problem units, I had a 2.7 in a Chrysler that kept logging timing codes, I added 1/2 a litre for about a week then overfilled it, with a liter of ATF and it was driven about 30 highway miles, and the oil changed no more codes. I use it, every fall in my gas unites and my New Duramax. Every time I do a major overhaul, or bearing roll in I would do it, and leave it running while I washed it. I do not recommend a solvent like flush.
Johnp33 is offline   Reply With Quote
Old 07-12-2015, 11:08 PM   #5 (permalink)
Junior Member
 
Join Date: Apr 2015
Posts: 4
Thumbs up

Been looking through sections and found this. Good read
JohnnyD is offline   Reply With Quote
Sponsored Links
Advertisement
 
Reply

  Engine Care & Maintenance Forum > Engine Care & Maintenance > Engine Lubrication/Oil


Currently Active Users Viewing This Thread: 1 (0 members and 1 guests)
 
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 On
Pingbacks are On
Refbacks are On


Powered by vBadvanced CMPS v3.2.2

All times are GMT -5. The time now is 06:37 AM.



Powered by vBulletin® Copyright ©2000 - 2019, Jelsoft Enterprises Ltd.
Search Engine Friendly URLs by vBSEO 3.3.2
Garage Plus vBulletin Plugins by Drive Thru Online, Inc.
vBulletin Security provided by vBSecurity v2.2.2 (Pro) - vBulletin Mods & Addons Copyright © 2019 DragonByte Technologies Ltd.
(c) AutoForums.com, Inc.