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Old 10-09-2012, 06:07 PM   #1
mr_yellow
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Default Switching oil weight for high mileage engine?

Hey Guys,

This question has been bugging me for a while... I tried searching but surprisingly didn't find anything. I didn't see anything in unabomber's FAQ either...

Basically the question is: is there a point where one should switch from the factory recommended oil weight (in this case 5w30) to another weight due to high mileage?

I see mobil1 10w30 advertised for high mileage cars... I'm almost at 200,000 kms and have been using 5w30 forever... Is it just marketing (not sure why since the oil costs the same) or is there a legitimate technical reason to go to a different weight on high mileage engines?

Thanks!
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Old 10-09-2012, 06:09 PM   #2
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Use rotella t-6.

/thread
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Old 10-09-2012, 10:20 PM   #3
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I don't think mileage should be a factor in choosing an oil. There are a lot of Rotella fanbois on this forum who think the stuff is holy water and will tell you that if you don't use it your engine will explode. Personally, I have just been using good non resource conserving oils in 10w30 flavor when they go on sale like QS Defy, Valvoline Maxlife Nextgen (can't beat free after rebate at AAP), and yes, Rotella. I'm 100% sure any 5w30 you've been using is doing its job though, or you wouldn't be at 200,000km.
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Old 10-09-2012, 11:28 PM   #4
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if...IF it isnt consuming any oil---or just a lil between changes...an old engine that has only had 5w30 in it may be best off staying with a 5w30 but using one of the good HM ones....
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Old 10-09-2012, 11:51 PM   #5
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Quote:
Originally Posted by Psychoreo View Post
Use rotella t-6.

/thread
Is Rotella T-6 the best choice for NA applications too? I've heard a lot of really good things about it for WRXs, but I've not heard it specifically recommended for the NA EJ25s. Are there any compelling reasons I should switch from Mobil1 High Milage 10W30?

Last edited by Tmibiker; 10-09-2012 at 11:57 PM.
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Old 10-10-2012, 12:20 AM   #6
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Quote:
Originally Posted by Tmibiker

Is Rotella T-6 the best choice for NA applications too? I've heard a lot of really good things about it for WRXs, but I've not heard it specifically recommended for the NA EJ25s. Are there any compelling reasons I should switch from Mobil1 High Milage 10W30?
Don't listen to me, I'm just one guy on the internet. Do some searching on here and you'll get the general consensus.
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Old 10-10-2012, 01:26 AM   #7
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Quote:
Originally Posted by Tmibiker View Post
Is Rotella T-6 the best choice for NA applications too? I've heard a lot of really good things about it for WRXs, but I've not heard it specifically recommended for the NA EJ25s. Are there any compelling reasons I should switch from Mobil1 High Milage 10W30?
is the engine consuming it??? NO...keep using what ya using now


do ya wanna go to a 10k mile oil change interval(NOT kidding)?? YES....switch to the t6

those are, really, the only reasons to switch...if ya gonna dump perfectly good oil every 3k miles....done even think of using the t6

you could likely even run the t6 to 15k miles if you change the fiter at 7k -8k miles and top it off, as necessary
that would make it cost effective to use it
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Old 10-10-2012, 07:38 AM   #8
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Quote:
Originally Posted by mr_yellow
Hey Guys,

This question has been bugging me for a while... I tried searching but surprisingly didn't find anything. I didn't see anything in unabomber's FAQ either...

Basically the question is: is there a point where one should switch from the factory recommended oil weight (in this case 5w30) to another weight due to high mileage?

I see mobil1 10w30 advertised for high mileage cars... I'm almost at 200,000 kms and have been using 5w30 forever... Is it just marketing (not sure why since the oil costs the same) or is there a legitimate technical reason to go to a different weight on high mileage engines?

Thanks!
If you aren't having leaks then you may not need to switch. The Mobil1 HM oils have additional seal conditioners, have a thicker viscosity within the same grade, have a higher High Temp High Shear, and have more anti-wear additives when compared to the regular oils. There is an M1 5W-30 High Mileage oil. Some people run them just because they're more robust.

-Dennis
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Old 10-10-2012, 09:22 AM   #9
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Quote:
Originally Posted by Uncle Scotty View Post
is the engine consuming it??? NO...keep using what ya using now


do ya wanna go to a 10k mile oil change interval(NOT kidding)?? YES....switch to the t6

those are, really, the only reasons to switch...if ya gonna dump perfectly good oil every 3k miles....done even think of using the t6

you could likely even run the t6 to 15k miles if you change the fiter at 7k -8k miles and top it off, as necessary
that would make it cost effective to use it
OP, sorry to hijack:

Scotty, I'm curious what your opinion is on time vs mileage for change intervals? Right now I'm only putting 6-7k per year on the car, so I've just been changing it every 6 months. Feels wasteful every time. How often would you change out the Rotella (or Maxlife, or m1 TDT or any flavor of good oil)
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Old 10-10-2012, 11:30 AM   #10
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To KNOW Senior ninja, do a used oil analysis with your next oil change at 6 months. Will cost you $20 at www.blackstone-labs.com and in the comments block specifically ask this. They will then recommend what you do based on the oil sample, this way you'll KNOW that by using XXXX oil, you can change it at whatever miles/time.
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Old 10-10-2012, 12:51 PM   #11
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Quote:
Originally Posted by Dr. Ninja View Post
OP, sorry to hijack:

Scotty, I'm curious what your opinion is on time vs mileage for change intervals? Right now I'm only putting 6-7k per year on the car, so I've just been changing it every 6 months. Feels wasteful every time. How often would you change out the Rotella (or Maxlife, or m1 TDT or any flavor of good oil)
i would just keep on doin what ya doin...change it every 6 months and done...oil wont really matter at all

the time interval at that mileage per year is more important
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Old 10-10-2012, 01:18 PM   #12
mr_yellow
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Quote:
Originally Posted by bluesubie View Post
If you aren't having leaks then you may not need to switch. The Mobil1 HM oils have additional seal conditioners, have a thicker viscosity within the same grade, have a higher High Temp High Shear, and have more anti-wear additives when compared to the regular oils. There is an M1 5W-30 High Mileage oil. Some people run them just because they're more robust.

-Dennis
Thanks for all the info! I guess I'll be sticking with my mobil1 5w30 and 5000km change interval since weight is not a big factor. Never seen HM 5w30 Mobil1. I'll have to check that out.

Regarding all the leak comments, I did have an oil leak but had the PCV valve and seals replaced so everything is better now.

Thanks again!
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Old 10-11-2012, 10:03 AM   #13
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M1 has high mileage 5W-30, 10W-30 and 10W-40.


Quote:
Originally Posted by bluesubie View Post
If you aren't having leaks then you may not need to switch. The Mobil1 HM oils have additional seal conditioners, have a thicker viscosity within the same grade, have a higher High Temp High Shear, and have more anti-wear additives when compared to the regular oils. There is an M1 5W-30 High Mileage oil. Some people run them just because they're more robust.

-Dennis
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Old 10-11-2012, 01:09 PM   #14
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Quote:
Originally Posted by CRAZYHAWK
M1 has high mileage 5W-30, 10W-30 and 10W-40.
I know.
And the 10W-30 meets ACEA A3 specs (like GC). I only mentioned the 5W-30 since the OP didn't realize that there was one.

http://www.mobil.com/USA-English/Lub...leage_Oil.aspx

-Dennis
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Old 10-14-2012, 08:12 PM   #15
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I've gotten good results with mobile 1 high mileage on other cars with 400k miles
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