Please help me understand Extended Oil Drain motor oils

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The Farmer

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Feb 25, 2024
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As I understand it, Extended Performance oils are long drain oils. Now, to further muddy the waters so to speak, there is also Valvoline Extended Protection. Is this also an extended drain motor oil? There is also Quaker State Ultimate Protection that advertises 20K mile oil changes, along with Supertech. Then there is Amsoil signature that advertises 25K mile changes, but it's double the price, if not more. Is it really worth the price for an extra five thousand miles?
 
This thread discusses the differences:

10,000 mile VS 20,000 mile engine oil

We have these extended protection oils, Castrol Edge 10,000 miles VS Castrol Edge Extended Performance 20,000 Miles. Mobil 1 10,000 VS Mobil 1 Extended Performance 20,000 What do they do to make the oil extended performance ? Is it the base stock or extra additives ? If i'm doing 5,000 mile...
bobistheoilguy.com
 
UOAs are your friend here… Some engines might be able to tolerate 10,000 mile plus oil changes (my Toyotas for example), some engines can’t handle over 4,000 (any GDI). The extended drain oils use better base stocks, generally have higher starting & lasting TBN… And generally state “change oil at manufacture’s suggested intervals”… 🤣
 
Oil at 15,000 miles is going to have twice as much products of combustion suspended in it than at 7,500 miles, which many people suggest as the longest to go between changes if you plan on keeping the vehicle long term. From 15K to 20K I can envision the filter being loaded with dirt and restricting flow or being bypassed altogether. If you only keep the car a few years or are leasing, by all means, 20K OCI is ok for YOU, if approved by the manufacturer.
 
Boatloads of existing threads for perusal. There are many more:

Extended Drain Oils

Mobil extolls the virtues of their EP oils, and a lot of people use the product. There are a number of European oils that are designed to be used for extended drain intervals. The Mobil oil has no European approvals that I could find, and some extended drain or Long Life European oils do have...
bobistheoilguy.com

Define "Extended Drains"???

What is your understanding of the term "extended drains?" How long is it? 10,000 miles, 15,000 miles, 20,000 miles,????
bobistheoilguy.com

Is an extended interval oil better than a standard one if changing at short interval?

For example, Castrol Edge and Castrol Edge EP. Let's say one is recommended for 5K while the other can go 10K. If you change both at 5K, is the wear, breakdown, etc. the same? Or does the standard oil protect better than the extended version until that point? Basically, is the performance of...
bobistheoilguy.com

Mobil 1 ESP: Good for extended drain intervals?

I seem to recall someone saying the M1 ESP oils were good for extended drain intervals. Is that the case? Are the various "flavors" good for 10K miles / 1 year intervals, especially in a 2011 Camry 4-cylinder engine? Does anyone have any TBN or Noack numbers on these oils? I've been able to...
bobistheoilguy.com

Extended Drain Intervals

I am wondering if anyone knows what the definition of "extended drain" means exactly? It used to be that auto manufacturers recommended 3000 mile drains, then 4000 mile drains and now some are recommending 7500 mile drains. I assume that these increasing drain intervals from the manufacturers...
bobistheoilguy.com

Extended Oil Drains

https://www.youtube.com/watch?v=5Znj6s-YRXo He should have removed the valve cover - the valve cover baffles always look nasty.
bobistheoilguy.com

Extended Drain Opinion

Do any of you think one of the reasons we are seeing more engines using oil than they did 10-20 years ago is due to the fact car makers have changed their OCV's guidelines from 3K to 5K to 7K to 10K.....? My understanding is some engines are being made "looser" to help mpg requirements and this...
bobistheoilguy.com

Information on Extended Drain

Hi Guys, Just got my username registered here this evening on BITOG. Am a member over on Bimmerforums, as I have a 1993 BMW 320i. Basically, I've joined here since I've spent so many, many, many hours reading hour I felt it might be time to give something back. I'm also curious about posting...
bobistheoilguy.com

Why Extended Drain Intervals Are A Bad Idea

I was on google trying to find a picture of my engine when I stumbled upon these pictures. http://www.jeepkj.com/forum/showthread.php?t=47101 It's just another reason to change the oil according to the owner's manual. On my car, its every 3,000 miles. On my parent's 2010 Honda Civic, its when...
bobistheoilguy.com

Pennzoil - Drain Intervals Q&A - Answers

Responses from: Sean Nguyen, Pennzoil Scientist and Automotive Lubricant Specialist Oil Drain Interval Questions: For modern direct injection engines that have significant fuel dilution (per used oil drain analyses) and drive for short trips, do you recommend using a heavier grade viscosity...
bobistheoilguy.com

What makes an oil an extended drain oil vs. other oils?

Let's say a racing oil like Motul 300V, which has a lumber-jack strength add pack and has the base oils to lube a freight train, but is not recommended for greater than around 5K miles OCI's; why would a "lesser" oil than a racing oil be good for 10-15K miles? What additives or whatever would...
bobistheoilguy.com

FYI.......Extended Drain Intervals and Warranties

Extended Drain Intervals and Warranties Q. The GM Factory extended 6/60 warranty I purchased for my Pontiac Grand Am states the following under the "Your Responsibilities" section: "YOU must properly maintain the covered VEHICLE which includes, but is not limited to, changing the engine oil at...
bobistheoilguy.com

Looking for extended drain oil

Well, I suppose I should change my forum name... I'm no longer a "forkman". In 2 weeks I start as a correctional officer in a medium security prison. I'll be moving and leaving my fiancee behind for a year (until she finishes college). I'm looking for an extended drain oil for her 94 Regal...
bobistheoilguy.com

Pennzoil & Valvoline - No Extended Drains

As someone pointed out to me, being both PZ/Valvoline are in the quick lube business, there is no incentive for them to make their oils long drain capable. For moderate drains, both products will perform as good as any other overall. However, if you look at some of the data out there and read...
bobistheoilguy.com

Article: Uncovering the Problems with Extended Oil Drains

Written in 2001: https://www.machinerylubrication.com/Read/238/extended-oil-drains
bobistheoilguy.com

True economics of extended oil drains

ASTM D7589 https://www.astm.org/Standards/D7589.htm OK, this one costs money, maybe there is a free download to be had in the ether. Basically fuel economy savings from resource saving engine oils vs a base-line oil disintegrate with age in use. For example; xW20 resource conserving provides...
bobistheoilguy.com
 
The Farmer said:
As I understand it, Extended Performance oils are long drain oils. Now, to further muddy the waters so to speak, there is also Valvoline Extended Protection. Is this also an extended drain motor oil? There is also Quaker State Ultimate Protection that advertises 20K mile oil changes, along with Supertech. Then there is Amsoil signature that advertises 25K mile changes, but it's double the price, if not more. Is it really worth the price for an extra five thousand miles?
Click to expand...
AMSOIL Signature Series Synthetic Motor Oil is recommended for 25,000 miles or 1 year oil change123. Even if you are a severe service driver, AMSOIL recommends 15,000 miles or 1 year, whichever comes first1. A rule of thumb for AMSOIL Signature Series Synthetic Motor Oil is guaranteed for 25,000 miles/12 months (15,000 miles/12 months in severe service)3.

You have not told us how many miles you drive a year or what Vehicle you are driving now. What is your driving style like, short trips, highway driving?
 
The Farmer said:
What's the difference between them?
Click to expand...
Antioxidant levels is a big one, along with enough TBN to not allow acids to overwhelm the oil.

As much as this topic is a circular exercise though, if you aren’t familiar with the precautions and actions needed to safely do an extended oil change without putting your equipment at risk, you really shouldn’t do it yet and spend some time reading the threads that @kschachn was kind enough to assemble for you. Happy learning!
 
Valvoline EP is not an extended oil change interval oil - if just offers extra wear protection versus Valvoline Advanced . At WM you will find Castrol , Mobil 1 and Quaker State extended oil drain interval oils . Most owners manuals state 3,750 miles for severe service , 7,500 miles for normal driving not extending beyond 12 months and some (Toyota) mayrecommend up to 10,000 miles / 12 months as an oil change interval . Most folks here do well by splitting the difference with 5,000 mile / 6 month oil change (which ever comes first) for typical mixed city . highway driving with a D1/Gen 3 rated synthetic oil of your choice at WM on roll back sale . Lastly , when you head above 7,500 mile oil change intervals (unless you are getting oil tests done , are a long time owner of the vehicle knowing it’s condition , etc. the chances of developing dirty engine rings , sludge , etc. tend to go up - so it’s really not worth it . If you have a GDI engine then that advice is doubled and 5,000 mile / 6 month oil max change intervals are your friend .
 
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