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Old 09-07-2022, 10:50 PM   #1
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Amsoil Oil mix?

I have two partial 2.5 gallon jugs of Amsoil and I would like to change the oil on my 2006 6.0 Ford diesel before a trip. I don't have enough time to order more oil from Amsoil before the trip. Both jugs are 15W-40 oil. One jug is "Premium Heavy Duty Diesel & Marine" and the other is "Signature Series Max-Duty protection." The "Signature" jug is the newer of the two.

Since they are both Amsoil synthetic and the same weight, any reason I should not mix the two? Together I should have just enough to do the oil change. I have the Amsoil dual bypass filter system on the engine.



2006 Ford RB, 6.0 diesel, SMB 4x4, RB50
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Old 09-08-2022, 11:05 AM   #2
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If they are both the right spec for the motor then no problemo

2009 E250 RB 5.4L "SilVan"
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Old 09-08-2022, 11:27 AM   #3
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From Amsoil's web site:


AMSOIL Synthetic Heavy Duty Diesel & Marine Oil is compatible with conventional and synthetic motor oils. Mixing AMSOIL motor oils with other oil, however, will shorten the oil’s life expectancy and reduce the performance benefits.
AMSOIL does not support extended drain intervals where oils have been mixed.
Aftermarket oil additives are not recommended for use with AMSOIL motor oils.

I use the Amsoil heavy duty marine grade and my mechanic gave me 2 gallons of the Amsoil max duty synthetic. Maybe I'll reconsider.

I think you'd be better off doing the change rather than do the trip with what's in the engine now. Just don't try their 12000 mile change interval.
2006 Ford 6.0PSD EB-50/E-PH SMB 4X4 Rock Crawler Trailer

Sportsmobile 4X4 Adventures..........On and off road adventures
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Old 09-09-2022, 07:50 AM   #4
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Amsoil tech help would tell you for sure.

2010 SMB
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