View Poll Results: What will the blackstone oil analysis say about 15,000 mile old oil?
The oil will be terrible, totally degraded, you've ruined your engine
![](https://www.clublexus.com/forums/images/polls/bar2-l.gif)
![](https://www.clublexus.com/forums/images/polls/bar2.gif)
![](https://www.clublexus.com/forums/images/polls/bar2-r.gif)
![](https://www.clublexus.com/forums/clear.gif)
13
24.07%
The oil will be just before/past its useful life, you've found the perfect change interval
![](https://www.clublexus.com/forums/images/polls/bar3-l.gif)
![](https://www.clublexus.com/forums/images/polls/bar3.gif)
![](https://www.clublexus.com/forums/images/polls/bar3-r.gif)
![](https://www.clublexus.com/forums/clear.gif)
28
51.85%
The oil will be fine, you could have gone longer
![](https://www.clublexus.com/forums/images/polls/bar4-l.gif)
![](https://www.clublexus.com/forums/images/polls/bar4.gif)
![](https://www.clublexus.com/forums/images/polls/bar4-r.gif)
![](https://www.clublexus.com/forums/clear.gif)
13
24.07%
Voters: 54. You may not vote on this poll
15,000 miles between oil changes - Results?
#47
![Default](https://www.clublexus.com/forums/images/icons/icon1.gif)
15000 miles interval is sick
i usually change it at 8-9k miles and i can say that when it comes closer to 8-9k miles the engine starts to run not as smooth as before, roars much than before. Not a healthy sound at all
at 15k miles it should run like a tracktor ))
i usually change it at 8-9k miles and i can say that when it comes closer to 8-9k miles the engine starts to run not as smooth as before, roars much than before. Not a healthy sound at all
at 15k miles it should run like a tracktor ))
#48
Lexus Fanatic
iTrader: (1)
![Default](https://www.clublexus.com/forums/images/icons/icon1.gif)
Folks have posted UOAs repeatedly here running 10k and more on conventional oil and the analysis came back the oil still had life in it, so no way synthetic would be anywhere near done before 15k or more.
Keep posting about "how you feel" or "what seems too long" all ya want... the actual science is, heavily, on my side here.
#49
![Default](https://www.clublexus.com/forums/images/icons/icon1.gif)
Always suspected that the whole "engine oil is spoiled w/in 3k-5k miles" was a scam, but good to have actual proof that it is. I suppose the dealers need continued revenue.
I planned on doing it anyway, but now I feel more comfortable doing an oil change per year (around 10k miles for me). I'll probably use synthetic just to make myself feel better, but all-in-all, I'll still be saving 2x the cost (as Lexus currently recommends an oil change every 6mo/5k mi and I'll be doing it myself).
I planned on doing it anyway, but now I feel more comfortable doing an oil change per year (around 10k miles for me). I'll probably use synthetic just to make myself feel better, but all-in-all, I'll still be saving 2x the cost (as Lexus currently recommends an oil change every 6mo/5k mi and I'll be doing it myself).
#50
Lexus Champion
![Default](https://www.clublexus.com/forums/images/icons/icon1.gif)
I don't think I'd be comfortable pushing my oil to 15K miles, especially if I were running on conventional oil, but based on some of the test results here, it's definitely do-able. I usually change my oil at around 7500 miles, but it looks like I could easily run it to 10K with no problems.
#52
![Default](https://www.clublexus.com/forums/images/icons/icon1.gif)
Running quality synthetic 15K mile will not be a problem when 14K on dino has proved to be OK. I'd be concerned about sludge running 14/15K miles on Dino. I'd like to see the valve train. I keep my car too long (min 100K miles) to use dino with extened oil changes.
Koz
Koz
Last edited by Koz; 02-13-10 at 09:03 AM.
#53
Lexus Fanatic
iTrader: (1)
![Default](https://www.clublexus.com/forums/images/icons/icon1.gif)
It'd certainly be fine changing synthetic 1/yr for mileage well into the 20-25k range for a good synthetic.
Again though all this is for normal driving... if you're frequently making very short trips where the motor never gets to operating temp I'd change significantly more often.
#54
Racer
iTrader: (3)
![Default](https://www.clublexus.com/forums/images/icons/icon1.gif)
The oil change interval is largely based on an old perception of how often oil should be changed, versus actual analysis proving that extended change intervals are just fine, especially when using oil that is more resistant to breakdown and proper filters. I think a distinction needs to be made between changing your oil for peace of mind, versus changing oil to avoid being 'cheap' on maintenance. Even then, spending on premium oil, or otherwise, and taking the time to send/pay for samples to verify your practices falls into the same category of being cautious, minus the paranoia. Its an objective, safe, and frugal method to care for your car.
#55
![Default](https://www.clublexus.com/forums/images/icons/icon1.gif)
Also I was told that oil change intervals also highly depend on the quality of the fuel you use (amount of sulfur in it too)
for example high quality fuel in Russia is pretty rare, mostly its something acceptable but not perfect, and such fuel gives a lot of wastes into the engine
for example high quality fuel in Russia is pretty rare, mostly its something acceptable but not perfect, and such fuel gives a lot of wastes into the engine
#56
![Default](https://www.clublexus.com/forums/images/icons/icon1.gif)
The ONLY safe way to run extended oil changes is to first use a quality full synthetic and have the oil analyzed after a reasonable amount of time. Since 10K miles has been proven to still provide safe protection using dino oil. 10K miles would be a good starting point for the first used oil analysis (UOA). Remember a one year time period is a safe cut off for each change. After the first UOA you will get a better idea of how long (Miles) you can continue using that oil (Within one year). Under ideal conditions I would not be surprised if oils such Amsoil 0w-30 could be used for over 20K miles (Within one year).
Using dino oil more than 10K miles could cause sludge build up in the areas of the engine where oil does not circulate well or pools.
Koz
Using dino oil more than 10K miles could cause sludge build up in the areas of the engine where oil does not circulate well or pools.
Koz
#57
Driver School Candidate
Join Date: Jul 2009
Location: Illinois
Posts: 19
Likes: 0
Received 0 Likes
on
0 Posts
![Default](https://www.clublexus.com/forums/images/icons/icon1.gif)
$7 for filter media with O-Rings
15 minutes under the wife's car
$32 bucks with tax and a few kisses from the wife.....Super cheap and ready to run for another 10,000 miles easy
Last edited by lobuxracer; 02-18-10 at 08:03 PM.
#59
Lexus Champion
Thread Starter
![Default](https://www.clublexus.com/forums/images/icons/icon1.gif)
I don't think I'd be comfortable pushing my oil to 15K miles, especially if I were running on conventional oil, but based on some of the test results here, it's definitely do-able. I usually change my oil at around 7500 miles, but it looks like I could easily run it to 10K with no problems.
... Remember a one year time period is a safe cut off for each change. After the first UOA you will get a better idea of how long (Miles) you can continue using that oil (Within one year). Under ideal conditions I would not be surprised if oils such Amsoil 0w-30 could be used for over 20K miles (Within one year)...
![Smilie](https://www.clublexus.com/forums/images/smilies/smile.gif)
https://www.clublexus.com/forums/car...-delivery.html
There is no need to change oil just because 12 months has elapsed.
#60
![Default](https://www.clublexus.com/forums/images/icons/icon1.gif)
It can easily go 10k miles with no problems. Look at my other thread which was my first oil change. I went the first 10k miles on the factory oil and blackstone came back and suggested I go 12k the next time and plenty of active additive left. Remember, that was the break-in oil. Subsequent oil changes should be good for longer than the break-in oil.
Why do you say "within one year"? I proved that to be a myth in my other thread where I went THREE years between oil changes and blackstone reported active additive left. Comon Koz!![Smilie](https://www.clublexus.com/forums/images/smilies/smile.gif)
https://www.clublexus.com/forums/car...-delivery.html
There is no need to change oil just because 12 months has elapsed.
Why do you say "within one year"? I proved that to be a myth in my other thread where I went THREE years between oil changes and blackstone reported active additive left. Comon Koz!
![Smilie](https://www.clublexus.com/forums/images/smilies/smile.gif)
https://www.clublexus.com/forums/car...-delivery.html
There is no need to change oil just because 12 months has elapsed.
That being said, I’m sure many others may have similar driving habits/conditions and we are talking about a, sort of, “Rule of Thumb” (to be safe).
This is the experts view;
"Our data base has many different engines that have various oil change intervals. We do have a few where the owner has kept the oil in use for up to two years but no longer than that. The percentage of those vehicle owners is quite small but we can tell you that the oils we have tested for them have shown average wear for the vehicle.
Most oils can hold up for two years without any major problems especially if the vehicle is driven. You average enough miles, per month, that I don't think you would have any problems. However, if that makes you feel uncomfortable, you can always change you oil sooner."
Koz