Rotella T6 Mixed with Mobil1 15w50

[user87]

OK so I have both of these sitting on the shelf and I was wondering if one could do a 50/50 mix without the additives causing a small thermonuclear explosion.

The application is a built turbo 2jzgte 3.0 straight six with a racing oil pump spinning to about 8k. Oil pressure is around 30psi at idle and 100psi under load.

it seems like the mix would be a 10w45 with decent properties, but I am not sure if that's what the outcome would be.

Thoughts from the experts?

 

[dlundblad]

I wouldn't do it. Not worth the risk.. See what happened here?

Link

 

[A_Harman]

Just run the straight M1 15w50. I wouldn't mix across brands and types (gasoline & diesel) like that. The additive packages are designed to work in completely different types of applications, and you end up diluting both to the point that they can't fulfill their original intents. If you're racing, use a racing oil.

How much boost are you running in that thing?
What kind of running are you doing with it? (Drag, auto-x, track?)

 

[29662]

In a "built" 2jzgte I would run the M1 15-50. Although the mix won't hurt anything the M1 is a much stouter oil with a higher HTHS.

 

[user87]

Street grandma driving with occasional trips to the drag strip. Lots of normal driving with sprints here and there, 4th gear pulls etc. No prolonged beatings like autocross or anything.

4-500hp depending on the boost (s366 turbo).

Also: the car has been running T6 since the break in was complete

 

[A_Harman]

Sounds like a fairly easy duty cycle, and not a crazy amount of power. I've heard of the 3.0 Toyota going way over 600 HP, even up to 1000.

When you say the engine is "built" what has been changed from stock internals? Have bearing clearances been loosened, have killer cams and valve springs been installed, etc?

Does the 2jz use belt or chain-driven cams?

 

[user87]

Belt driven cams, 264 9.3mm lift cams, Ferrea beehive springs. From what the engine builder said I expect the bottom end tolerances to be looser than stock but not too crazy.

Clevite bearings, Manley I-beam rods, CP pistons, stock crank.

My main hesitation is I would not like to push the pressure any higher than where it is with t6 ideally (the oil pump is shimmed). I'm not sure how much it would go up with the switch to a 15w50.

 

[29662]

Originally Posted By: user87
Street grandma driving with occasional trips to the drag strip. Lots of normal driving with sprints here and there, 4th gear pulls etc. No prolonged beatings like autocross or anything.

4-500hp depending on the boost (s366 turbo).

Also: the car has been running T6 since the break in was complete


4-500 HP is hardly a built 2jz, I would called that just warmed over... lol.. When you said built I was thinking 700+, as the stock internals on a 2jz are reportedly good for 600+. Yeah the T6 (HTHS of about4.0), or a mix should suffice. What kind of boost are you running at the track?

 

[user87]

16-18psi max for now, no traction... its in a Nissan 240

 

[Driz]

Originally Posted By: dlundblad
I wouldn't do it. Not worth the risk.. See what happened here?

Link



Me either. If it was going it the daily driver sure why not. From what you are saying here your rig is anything but that. I bet you plowed a pile of cash into it so why on earth would you cheap out over a gallon of motor oil. Do yourself possibly a big favor and just get whatever you need to run your motor. Motor oil doesn't spoil and you will use it somewhere and may save yourself thousands of dollars in headaches later on. For $25 always better safe than sorry.

 

[user87]

Yep, that's why I asked. I still ponder which to run overall though. I prefer to be able to run something I can pick up locally. From everything I have researched it looks like these 2 are pretty good for what I am doing.

I guess it just comes down to a trade off in pressure, cold start wear, and better protection under high load.

There is always amsoil and redline that could be ordered and shipped...

 

[29662]

Being in Florida I would run the 15w50 M1. Its available at Walmart for a comparable price to T6.

Where do you run, PBIR/Moroso?

 

[user87]

Do you think there will be a dramatic pressure increase in the switch, or just a couple of psi? I guess I will just have to run it and find out.

The car will run at OSW occasionally, but it has not been there since the build up