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Rotella T6 Motor Oil

Old 11-11-2020, 07:39 AM
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Default Rotella T6 Motor Oil

Ever since I heard about the marvel of this oil and researched it over 10 years ago, It is the only motor oil I use from my buggies, dirtbikes, quads, toyhauler generator, motorcycles, cars and truck. Never had a problem with the motor. I am guessing the majority have never heard of Rotella T6 (formerly labeled as diesel oil) but briefly because it was made for diesels that under go more stress, there are much more added chemicals to provide better lubrication. But those that are farmiliar with it, would you or have you dropped it in your 4 stroke outboard? I have recently repowered with a used Yamaha 225.
Old 11-11-2020, 07:50 AM
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I use it in my old Ford F350 that now has 300K miles....and everything else. Zuke outboards, quads, atc, generators, lawnmower and 66 C10.
It's good oil.
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Old 11-11-2020, 07:54 AM
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If your Yamaha allows a 40 weight, it would be fine. Strong tbn, good hths, higher z and p levels, good moly/boron combination, strong detergent package. Better specs than many nmma certified oils.
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Old 11-11-2020, 07:55 AM
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I use the non synthetic Rotella (T4 I think?) in many items. My new diesel generator warns against using synthetic before 500 hours and I have heard similar things about four stroke outboards making oil when synthetic is used early on in life. But I'd have no concerns using T6 in higher hour anything that is well past break in..
Old 11-11-2020, 08:07 AM
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I use T4 dino oil in most everything. Cummins marine 450, boat diesel gennie, house hurricane gennie (kubota diesel), old Chev truck (vortec gasser). The Cummins gets 15w-40, all else gets 10w-30.

Only thing I use T6 5w-40 is the VW diesel car. It has a dry turbo that is prone to coking, so syn oil is pretty important there.

I could use T6 in everything, but don't see the benefit other than the VW. The Cummins turbo is water cooled and has lasted 20yrs and 4000hrs on dino oil. The VW specs exclusively syn oil, Cummins does not.

In over 20yrs in the diesel engine business, pretty much use Rotella exclusively. Not saying it is the best oil out there, but have had no problems with using it. Basically use it because it is easy to get anywhere.

It also does carry some ratings for gassers, so it's not like you are putting an exclusively diesel oil in your gasser.
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Old 11-11-2020, 08:25 AM
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Oils high in ZDDP can cause problems with catalytic converters.
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Old 11-11-2020, 08:29 AM
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If someone runs diesels it would be interesting if someone didn't hear or read about T6.

I don't use T6 since I run Cummins, as Corndog said, but I do use Rotella.

Last edited by Esuomm1; 11-11-2020 at 09:14 AM.
Old 11-11-2020, 08:57 AM
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Shell has been neck deep in racing and oil development for a long time and as a result Rotella has a proven pedigree born out by thousands of hours of high performance engines screaming around a track and literally grillions of miles of semi's getting it done around the world. Is it amongst the best oils available? I would say yes with little qualification needed but is there any benefit over Wally World oil for the average user rolling a Duramax truck, Toyota car of Yamaha OB? Once you reach the point of good enough you hit a wall of rapidly diminishing return. I've bought and used a ton of Rotella myself but not in pedestrian applications.

Edit: If you surveyed 100 or 1000 semi truck owner operators you would find an even split of Rotella and Mystik proponents with some lesser amount favoring Chevron Delo.
Old 11-11-2020, 08:57 AM
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I run it in my outboards
Old 11-11-2020, 09:09 AM
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Originally Posted by billinstuart View Post
Oils high in ZDDP can cause problems with catalytic converters.
Thats the reason why they took the SN rating off the bottle. I still use it in my volvo penta though because there is no catalytic converter.
Old 11-11-2020, 09:16 AM
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Originally Posted by billinstuart View Post
Oils high in ZDDP can cause problems with catalytic converters.
That might be a concern if you have a car/truck that uses like a qt in 1000 miles. If you can basically go a full oil change without adding oil, not much ZDDP goes through the cat.

I would not use Rotella in a new high tech gasser car/truck (I sure don't have that problem). Use what the mfr specs. All my machines are pretty old.
Old 11-11-2020, 09:36 AM
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I've heard nothing but good reports on T6 and I'm considering using it in my F250 Yamaha's.
Old 11-11-2020, 10:25 AM
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Originally Posted by billinstuart View Post
Oils high in ZDDP can cause problems with catalytic converters.
New diesels have catalytic converters.
Old 11-11-2020, 12:09 PM
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Originally Posted by tarpononecharter View Post
I've heard nothing but good reports on T6 and I'm considering using it in my F250 Yamaha's.
Not being snarky or trying to go down the oil thread rabbit hole but....why? What perceved advantage do you think any synthetic would offer you? Somewhere right now in coastal Louisiana some crabber his twisting the throttle on his 5000 hour F70 Yam that has only been fed the cheapest oil he could find and likely at 200 hour intervals. And when this neglected and abused old bullet finally dies it won't be from oil related wear.
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Old 11-11-2020, 12:41 PM
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I run it in my Honda Goldwing. It works wonders for promoting smoother shifting in an engine that shares lubrication with the transmission.
Old 11-11-2020, 02:12 PM
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I have never used it in my outboards,
It's all I run in my KTM 530 EXC dirtbikes though and it's been great for them.
Old 11-11-2020, 02:32 PM
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I use it in my f200s and previously on my f150 outboards. Run it in my last 2 powerstrokes. Great oil, readily available and affordable.
Old 11-11-2020, 02:38 PM
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Rotella is not all that great. There are many many better oils out there. They did well marketing to the diesel crowd. That said, I put 2.5 gallons in my duramax a couple weeks ago. Tractor supply sells it dirt cheap.
Old 11-11-2020, 02:53 PM
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Originally Posted by HTJ View Post
Not being snarky or trying to go down the oil thread rabbit hole but....why? What perceved advantage do you think any synthetic would offer you? Somewhere right now in coastal Louisiana some crabber his twisting the throttle on his 5000 hour F70 Yam that has only been fed the cheapest oil he could find and likely at 200 hour intervals. And when this neglected and abused old bullet finally dies it won't be from oil related wear.
My boating "season" is a six month season and I typically put about 150 hours on my motors per season. I do my own maintenance and I only want to do one oil change a season so I switched to full synthetic and extended the drain interval. I did this on my 3.3 F250's using Amsoil and had 2,000 trouble free hours. Unfortunately Amsoil is no longer sold at my local hardware store so I want to change to another full synthetic that is readily available. My results may all be anecdotal but this routine has worked for me so why change?
Old 11-11-2020, 02:56 PM
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PS - My 4.2 F250's appear to not be making oil so I switched to synthetic at 300 hours. Time will tell but so far all is good.

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