Which Amsoil?
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Which Amsoil?
My truck has 20k miles and I want to change over to synthetic oil and a bypass filter. Which Amsoil motor oil is best for a 2006? The Series 3000 5/30 and the Marine 15/40 are both recommended by Amsoil, and I am wondering which is best for my application.
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Thanks for the info. I was kind of leaning in the direction of the 15/40, but the possibility of more mpg with a lighter 5/30 weight oil (less drag in the engine) was kind of attractive. The other thing that made it hard to choose was that the four ball wear tests between the two oils gave almost identical results.
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#9
Crap John! I just bought the 15w40 marine. After I saw my UOA on the 5w40 Rotella syn I think I'm sticking with the heavy weight. I was shooting for the best one this go around though.
Wood
Wood
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I sent my original question to Amsoil's tech help section and just got their answer back. They recommend the HDD 5-30. As long as it really is better I don't mind the fact that it is significantly more expensive than their other diesel rated oils. With oil analysis the cost should be spread over a long enough time that it doesn't amount to that much. If mileage is improved it might even pay for itself with the high cost of diesel.
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it depends on the climate really, if you live in a hot place mostly year round (south of I-10) then the 5-40 will do fine, if where you live actually has winters and cold months, then the 15-40 is the best all around.
#13
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Then why does Dodge recommend a 5w-40 in winter climates? And I don't recommend the Amsoil 5w-40 to any 5.9 owner, either the HDD 5w-30 or AME 15w-40.
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Tony
#15
As stated, you got it backwards. Lighter oil for colder climates, thicker for warmer.