Adding Amsoil AME 15W40 to Rotella T 15W40

[A310]

I'm running Rotella T 15W40 in my 93 Cummins and getting great results. I've been reading about the new CJ4 oils and the reduction of ZDDP and how important this is to the older tappet diesels. I looked at the Amsoil AME oil and it has lots of Zddp and is also synthetic. My plan is to top up the Rotella T 15W40 with the Amsoil Ame 15W40 as the engine consumes oil, (about 1 Quart per year) running the Puradyn TF-24 Bypass system. Is there any harm in adding this new synthetic oil to the Dyno oil. Thanks in advance.

 

[Koz1]

Can AMSOIL lubricants be safely mixed together?
Answer: Applications require specific lubricant properties to deliver maximum performance and protection. AMSOIL carefully tailors its synthetic lubricants under the strictest quality control standards to provide the required properties for the intended application. Mixing AMSOIL synthetic lubricants is not only unnecessary, it may lead to reduced performance and even equipment failure.

Automatic transmission fluids offer a perfect example. Some transmissions require lubricants that contain specific frictional characteristics to reduce, or eliminate, clutch slippage, while other transmissions may require different frictional requirements. Mixing fluids recommended for different performance specifications may lead to a host of problems, including erratic shifting and transmission failure.

In some applications, mixing lubricants may not lead to equipment failure, but it will reduce performance. For example, if AMSOIL Signature Series 5W-30 Synthetic Motor Oil is installed in a vehicle, and its owner adds AMSOIL OE Synthetic 5W-30 Motor Oil to top off the engine if Signature Series isn’t available, the vehicle will continue to operate perfectly; Signature Series and OE Synthetic Motor Oil share a similar chemistry, and formulations of the same viscosity can be safely mixed. However, mixing lubricants will shorten Signature Series' life expectancy and reduce its performance benefits. AMSOIL does not support extended drain intervals where oils have been mixed.

To minimize the risk of performance- and warranty-related issues due to improper mixing, AMSOIL does not recommend mixing AMSOIL synthetic lubricants.

http://www.amsoil.com/frequent.aspx

Amsoil says dont do it.

Some people mix different Brands with no harm done, it is in the realm of possibility that harm will come.
I wouldn't mess with HDEOs buts that's just me, they see much more strenuous variables than regular engine oils.

 

[BigCahuna]

You have a 22 year old motor that runs fine and only uses a qt of oil per year. You will spend alot more for a qt of Amsoil then you will for Rotella, and not see any difference in how it runs. Why mess with something that's working fine for you?.,,,

 

[Ramblejam]

1. Additive package is more important than base oil.

2. http://www.swri.org/3pubs/brochure/ae/pdf/cumminsisb.pdf

3. "Enhanced wear control in Cummins ISB test (15% reduction in cam lobe wear, 46% reduction in crosshead wear)"
http://www.phillips66lubricants.com/documents/titanium/ConocoPhillips_JobbersWorld_02_01_09.pdf

 

[A310]

Thanks for the comments and articles guys, I think I'll wait until I have to change the oil before I add in the Amsoil.

 

[BrocLuno]

But you could top up with Rotella T6 and start to gain some synthetic if you wished. I personally wouldn't do it, but others have mixed these two and done OK ...