Originally posted by johnpr3:
This is a blackstone lab report on the 0w-30 Amsoil,that ADF1 calls kool aid.
I'm not sure what makes this oil analysis so special. Show us a trend over time, not a snapshot in time. Did the oil viscosity continue on the low side? Did that cause wear metals to trend up? How can Blackstone recommend pushing the drain interval out to 7500 miles? Based on their UOA the oil viscosity dropped from 10.3 cSt@100C (AMSOIL data sheet) to 8.32 cSt@100C (Blackstone results), also the flashpoint dropped from 446F to 380F. If it was me, I would like to know why that was happening before I tried going further on an oil change.
John, this looks to be a heavily modified street legal car that sees hard runs at the drag strip on weekends. The wear metals are extremely low for this type of service, lower than for regular cars at half the oil change interval. I'd say Blackstones analysis and recommendations are right on.
This message has been edited. Last edited by: Tim Vipond, Fri May 21 2010 10:01 PM
I think you are missing the concept of oil analysis. My statement isn't for or against AMSOIL service life. I was commenting more on the lab report and comments or recommendations by the lab. When one see's a viscosity drop like in the sample along with a drop in flash point, one has to wonder why that happened. My guess off the cuff would be fuel dilution. I would like to confirm that before I tried extending drains. When you see a drop in viscosity like that, wear metals might not show up for another oil change or two. Kind of a cause and effect. My guess is that AMSOILS technical deptartment would NOT recommend extending that oil, at least, not in writing. There are too many unknowns with regards to the one sample. Not to mention, no TBN or TAN testing. My opion is that the lab was reckless with their comments.