Rotella T6 5w 40 in 7mgte

Zrain25

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#1
I heard people like to run 5w 40 synthetic in the 7mgte

I run it in my 7.3 diesel I know it's great oil. Will it work great in these engines too.
 

Poodles

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#4
Moved to the proper section.

The Castrol made be available under a different name there, you'd have to bug someone (paging IJ) that would know.
 

Zrain25

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#6
The guy before me ran 15w50 in it. It' has 140,000 on it so thin oil won't work to well untill it's rebuilt. I just heard of people running 5w 40 in it. I know it's great oil but idk if its great oil in a 7m
 

radiod

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#7
The 7M was designed for a 5w30 oil. If you do increase the weight you'll essentially be trying to push thicker fluid through the same gaps in the bearings. Not saying that it won't work, but it's not optimal. That being said, over time these gaps get larger from regular engine wear. I won't say putting 5w40 is the right thing to do in a higher mileage engine, but it's something I've done in the past. It's a topic that can be debated back and forth either way. Regardless of whatever you do though, 15w50 is definitely too thick.
 

Zrain25

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#10
No I thought i could use it because if it runs of off thick 15w 50 it will run off of 5w 40. Be easier for the engine to move the oil around when cold
 

jdub

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#11
The guy before me ran 15w50 in it. It' has 140,000 on it so thin oil won't work to well until it's rebuilt. I just heard of people running 5w 40 in it. I know it's great oil but idk if its great oil in a 7m
If you are referring to GC 3W-30 as a "thin oil", that simply is not true. GC hot viscosity approaches the 40W range. GC is not thin by any means


So I'm thinking that the 5w 40 will work. If it can take the punishment I put in my truck it should handle the supra.
T6 will work (and work quite well), but not because it works in your truck. It will work because T6 has a fairly low cold viscosity and it's hot viscosity is suitable for the 7M...not because it works in your truck.


No I thought i could use it because if it runs of off thick 15w 50 it will run off of 5w 40. Be easier for the engine to move the oil around when cold
Your oil choice is sound, but the logic for using it is not...another case of dumb luck choosing an oil ;)
 

Zrain25

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#12
I understand. I'm not using because it works in my truck. I'm using it because like u said above the low viscosity when cold. And viscosity when warm. That is why I'm using it.

I use to to run rotella 15w40 in my truck. I don't know if u guys have diesels but in the winter they don't like to start. With 15w40 it didn't want to start easy. Switched to synthetic 5w40 and it starts with ease at -10.

5w40 seamed to me that it's the right viscosity for my 7m just trying to get ur thoughts.


After the engine is rebuilt I will be running a thinner oil because the engine will be alot tighter then it is now.
 

jdub

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#13
Now you're making a little more sense ;)
I do have a diesel truck and I bet you can guess what oil I use ;) It doesn't get terribly cold in Phoenix, but it does in Flagstaff...my powerstroke is the same cold natured beast you described.

T6 will work great in any of the Supra motors, especially those with higher mileage bearing wear...like yours ;)
 

IndigoMKII

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#15
If you're set that you need a thicker oil because of your engine wear, what is your oil psi during cold/hot runs? Your engine might have 140k on it but are the clearances that screwed up that you'd need to step to a thicker oil?

I'm not trying to be a douche, I'm just trying to understand why you need the thicker oil.
 

jdub

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#18
What year do u have? I like my powerstroke as much as my supra
It's a 2001 7.3L...I really like that motor ;)


If you're set that you need a thicker oil because of your engine wear, what is your oil psi during cold/hot runs? Your engine might have 140k on it but are the clearances that screwed up that you'd need to step to a thicker oil?

I'm not trying to be a douche, I'm just trying to understand why you need the thicker oil.
Bearing wear will cause pressure to drop...his psi indications show it. In this case, a slightly thicker oil will provide a better surface to minimize metal-to-metal contact between the bearing and the journal. A 5W-40 is not excessively thick for this motor, a 15W-50 is. It's not going to fix the problem (excessive clearance due to wear or improper build), but it will buy some time. The proper solution is to re-build the engine.
 

Zrain25

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#20
Just talked to previous owner he said the gauge sometimes didn't work. He said its reads great while driveing but at idle sometimes it reads low. I'm gunna test it with a better gauge
 

grimreaper

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#21
you should test with a mechanical gauge.
mine with 10w30 at idle: Stock gauge = 0-5psi, prosport electric = 8psi, mechanical =12-14 psi.
 

grimreaper

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#24
^ this, checked once a year with each plug change. Also mounted a fitting and briaded oil line to move the oil pressure sender under the intake filter. R&R the sender takes minutes..
 

scmaluco

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#27
I've been running rotella T which is 5-w40 for the past 6 years.. walmart for the win lol anyways on my 04 f250 diesel with 07 front end.. beautiful truck by the way Zrain25 mine was a Lariat 6.0 shitty motor but lasted me a while crew cab 4x4. anyways my 04 yamaha r1 . one of them i sold with 80k plus miles. never had one thing go wrong except for my starter due to being old and starting to much it went out.. other than that my wifes 03 solara and all the other cars i had. 93 rx7, civics you name it.. to be honest one of the best oils you can buy.. not to mention the price. :) i'm in CA so weather here doesn't get too cold.. in the 30s but yeah.
 

Zrain25

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#30
No idea I would go with a thinner oil. My supra likes it but it has a 150,000 unknown miles ya know. My new engine when I drop it in will probably not get t6 oil
 

te72

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#31
lol 99 crew cab 7.3 here too haha. so how about 5-40 t6 rotella in a newly rebuilt 2jz? ive been using castrol gtx 5-30w
No idea I would go with a thinner oil. My supra likes it but it has a 150,000 unknown miles ya know. My new engine when I drop it in will probably not get t6 oil
Been running it in my 1j for about 3 years now. Last couple oil analysis reports seem to suggest that all is well for the most part. I'd recommend changing by the time you have a year on it. I pushed mine for ~1.5 years, and it seems to have gone up a bit on the wear metals, possibly a bit of an upward curve. I.e. if I kept running that oil, it would have gotten worse, faster and faster, the longer I ran that batch of oil.

Kinda hard to say since I've only had 2 changes checked out so far. Should be able to establish a pattern with a couple more years. All in all though, it's a good oil, highly recommend it.