Chevy and GMC Duramax Diesel Forum - Reply to Topic
General Discussion General Diesel Discussion.

Thread: Amsoil: friend or foe? Reply to Thread
Send Trackbacks to (Separate multiple URLs with spaces) :
Post Icons
You may choose an icon for your message from the following list:

Register Now

In order to be able to post messages on the Chevy and GMC Duramax Diesel Forum forums, you must first register.
Please enter your desired user name, your email address and other required details in the form below.

User Name:
Please enter a password for your user account. Note that passwords are case-sensitive.


Confirm Password:
Email Address
Please enter a valid email address for yourself.

Email Address:


Human Verification

In order to verify that you are a human and not a spam bot, please enter the answer into the following box below based on the instructions contained in the graphic.

  Additional Options
Miscellaneous Options

  Topic Review (Newest First)
01-21-2013 09:51 PM
Originally Posted by Tow Master View Post
I always thought high oil pressure was a good thing?
To a point? I think you can get your oil pressure too high? I guess gm says that anywhere on the gauge is "normal operating pressure." Or something like that.
01-21-2013 09:30 PM
Tow Master I always thought high oil pressure was a good thing?
01-20-2013 05:49 PM
Dieselpower410 02 lb7 amsoil works great have about 10k on it still clean and not black great oil pressure also no less than 40psi at idle!
01-19-2013 02:47 PM
Originally Posted by Goose2448 View Post
If Royal Purple made 15W-40 I would use that.
They do. That's what I use. But, I just ordered some AMS oil, and plan to start using that from now on. I already put it in my Excursion 6.0L. Will put in the next Dirty Max that needs a changin'.
01-19-2013 01:26 PM
Originally Posted by danhr View Post
I can't believe that no one caught that the OP has 90 psi of oil pressure while driving around and is considering that a BAD thing, and is using that as his reason to switch oils.
After awhile it drops and runs 20 to 40
01-19-2013 10:51 AM
Jacqson Redline 15W-40 here. I was looking at using the Amsoil Premium CJ-4 Synthetic but I can get the Redline cheaper as the Redline distributor up here is a close friend of mine, plus Redline has the highest HT/HS numbers I've seen in a Diesel engine oil and to me that's important.
01-19-2013 10:47 AM
starspangled6.0 I ran AMSOIL Sig Series in the 6.0 last year for 11 months. The analysis said the oil was doing fantastic, but I needed to change it at 6 months cuz of a small anti-freeze leak.

We've also got AMSOIL in the trans in the Sierra (4L80E), and it runs much, much better then the Allison in the Silverado. I know, not apples-to-apples, but I've seen it firsthand that this stuff out-performs anything on the market. I can't wait to get the Allison changed over AMSOIL, as well as in the engine.
01-19-2013 10:28 AM
slo truck
Originally Posted by flyinelvis11 View Post
hmmm....poll choices: amsoil, three rotellas and other...

do you work for shell? something smells fishy here....
LOL i do and swap between T6 and Amsoil. Kinda what i am in the mood to pay. Its 50/50 pretty much to me.
01-19-2013 10:26 AM
danhr I can't believe that no one caught that the OP has 90 psi of oil pressure while driving around and is considering that a BAD thing, and is using that as his reason to switch oils.
01-19-2013 10:18 AM
gr8shot I can't believe nobody has talked about good ol Mobil Delvac 1300 super. After all, it's what comes in our trucks from the factory, and is one of the best conventional oils on the market.

Its probably the best oil for the money, and it's dirt cheap too. Here's an analysis from my old truck, a DPF deleted LMM. No EGR blocker, just turned off in the tuning. Ran close to 10k miles, lots of towing, and even quite a bit of idle time as well. Analysis came back perfect. I can change my oil every 10k miles for about $40.

Attachment 63981

I have a sample from my lb7 with right at 10k on it that I'm sending in for analysis right now. I'm pretty confident it'll come back pefect as well. For me, and my driving styles, the math works out for me to stick with conventional, and delvac is awesome oil, and it's cheap as heck!
This thread has more than 10 replies. Click here to review the whole thread.

Posting Rules  
You may post new threads
You may post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off

For the best viewing experience please update your browser to Google Chrome