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Old 09-03-2010, 04:35 AM
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Amsoil...25000 miles?

Reading on amsoils site the other day, and they claim with their synthetic oil and their filter 25000 miles or once a year oil change? Is this for real? Anybody tried this? What did that oil look like at 25k miles?
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Old 09-03-2010, 04:51 AM
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I wouldnt on a HEUI injected truck, like the 7.3 or 6.0 because those trucks need perfect oil to run. After so many miles there is oil shearing and it breaks down the viscosity.

Now on a different truck maybe. I only push mine to 7500 and thats on full synthetic and I check the level every now and then cause these trucks normally go through a quart an oil change because the CCV
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Old 09-03-2010, 06:29 AM
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Quote:
Originally Posted by BigDs_2000 View Post
Reading on amsoils site the other day, and they claim with their synthetic oil and their filter 25000 miles or once a year oil change? Is this for real? Anybody tried this? What did that oil look like at 25k miles?
That is for gas engines only.
I know a few people that run it for that extended mileage. One has 380k on a dodge hemi, been running Amsoil since day one.

The diesel oil doesn't have an actual mileage rating. They say "up to 3x oil life" depending on driving habits. Change interval should be done by oil analysis.
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Old 09-03-2010, 06:33 AM
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I change mine once a year (18,000 miles) and use (and sell) AMSOIL 15W40. I always send in a sample to be tested and it has always come back "OK TO CONTINUE USING". Never had an engine related problem.
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Old 09-03-2010, 06:38 AM
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Originally Posted by Hank View Post
I change mine once a year (18,000 miles) and use (and sell) AMSOIL 15W40. I always send in a sample to be tested and it has always come back "OK TO CONTINUE USING". Never had an engine related problem.
how many miles on your rig
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Old 09-03-2010, 07:36 AM
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I always love these threads. An Amsoil dealer once posted oil analysis results on a website (which is no longer around). He was touting how long he could run oil and blah blah blah. Nearly ALL of his oil samples (he posted at least 10) said something along the lines of low viscosity. That's not a feature I like in my oil...
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Old 09-03-2010, 08:04 AM
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You can try going 25k and tell us what happens...


Me, I personally will continue to use conventional 15w40 in this truck, and change it ever 5k miles.
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Old 09-03-2010, 09:58 AM
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Originally Posted by ju015dd View Post
how many miles on your rig
156,000 miles

Viscosity is always good!
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Old 09-03-2010, 02:16 PM
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I would never try running longer than 3-4k unless I did a oil analysis
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Old 09-03-2010, 07:19 PM
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Originally Posted by CT Performance, Inc. View Post
I would never try running longer than 3-4k unless I did a oil analysis
This. Just do a change with Amsoil and do regular tests. Really, a test is 25 bucks. Much cheaper than fluid and filter. So you could do a test every 2.5k up to 7.5k then do a test every 1-2k after that until you need to change.
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