A Activity diagram used in UML 6/9 and SysML B Bachman diagram Booch used in software engineering Block diagram Block Definition Diagram BDD used in SysML C Carroll diagram Cartogram Catalytic cycle Chemical equation Curly arrow diagram Category theory diagrams Cause-and-effect diagram Chord diagram Circuit diagram Class diagram from UML 1/9 Collaboration diagram from UML 2.0 Communication diagram from UML 2.0 Commutative diagram Comparison diagram Component diagram from UML 3/9 Composite structure diagram from UML 2.0 Concept map Constellation diagram Context diagram Control flow diagram Contour diagram Cordier diagram Cross functional flowchart D Data model diagram Data flow diagram Data structure diagram Dendrogram Dependency diagram Deployment diagram from UML 9/9 Dot and cross diagram Double bubble map used in education Drakon-chart E Entity-Relationship diagram ERD Event-driven process chain Euler diagram Eye diagram a diagram of a received telecommunications signal Express-G Extended Functional Flow Block Diagram EFFBD F Family tree Feynman diagram Flow chart Flow process chart Flow diagram Fusion diagram Free body diagram G Gantt chart shows the timing of tasks or activities used in project management Grotrian diagram Goodman diagram shows the fatigue data example: for a wind turbine blades H Hasse diagram HIPO diagram I Internal Block Diagram IBD used in SysML IDEF0 IDEF1 entity relations Interaction overview diagram from UML Ishikawa diagram J Jackson diagram K Karnaugh map Kinematic diagram L Ladder diagram Line of balance Link grammar diagram M Martin ERD Message Sequence Chart Mind map used for learning, brainstorming, memory, visual thinking and problem solving Minkowski spacetime diagram Molecular orbital diagram N N2 Nassi Shneiderman diagram or structogram a representation for structured programming Nomogram Network diagram O Object diagram from UML 2/9 Organigram Onion diagram also known as "stacked Venn diagram" P Package diagram from UML 4/9 and SysML Parametric diagram from SysML PERT Petri net shows the structure of a distributed system as a directed bipartite graph with annotations Phylogenetic tree - represents a phylogeny evolutionary relationships among groups of organisms Piping and instrumentation diagram P&ID Phase diagram used to present solid/liquid/gas information Plant Diagram Pressure volume diagram used to analyse engines Pourbaix diagram Process flow diagram or PFD used in chemical engineering Program structure diagram R Radar chart Radial Diagram Requirement Diagram Used in SysML Rich Picture R-diagram Routing diagram S Sankey diagram represents material, energy or cost flows with quantity proportional arrows in a process network. Sentence diagram represents the grammatical structure of a natural language sentence. Sequence diagram from UML 8/9 and SysML SDL/GR diagram Specification and Description Language. SDL is a formal language used in computer science. Smith chart Spider chart Spray diagram SSADM Structured Systems Analysis and Design Methodology used in software engineering Star chart/Celestial sphere State diagram are used for state machines in software engineering from UML 7/9 Swim lane Syntax diagram used in software engineering to represent a context-free grammar Systems Biology Graphical Notation a graphical notation used in diagrams of biochemical and cellular processes studied in Systems biology System context diagram System structure Systematic layout planning T Timing Diagram: Digital Timing Diagram Timing Diagram: UML 2.0 TQM Diagram Treemap U UML diagram Unified Modeling Language used in software engineering Use case diagram from UML 5/9 and SysML V Value Stream Mapping Venn diagram Voronoi diagram W Warnier-Orr Williot diagram Y Yourdon-Coad see Edward Yourdon, used in software engineering
Amsoil, Shaeffers and T6 are all very capable fluids. But, depending upon individual application of fluid and equipment, there may or may not be a clear "winner" above the others. The real question is whether, in your specific situation, is a premium lube worth the additional cost, relative to the performance it can provide?
Amsoil EAO filters tout 99% filtration @20microns, but the test done by Ascent Filtration Labs shows Fram XG 99% @15microns. For the price, I would hope Amsoil is a better quality filter, but Fram seems to filter down pretty well. Any thoughts?
If I am buying Amsoil, I really don't see the point of buying anything other than their Signature Series. Then again, I live in the US and there are plenty of quality oils available at Walmart for under $6 qt that are extremely comparable to Amsoil's Extended Life (and below) products.
Amsoil has 2 0W 20's that are API certified, the 'XL' and 'OE' 0W 20. IF you want to go with Amsoil, maybe choose one of those. I'm not an Amsoil user, but Amsoil fans seem to react pretty violently when the possible warranty implications of using Signature Series are brought up.
Similar threads Amsoil Signature Series 0w 20 rstcso Jun 13, 2025 Virgin Oil Analysis PCMO HDEO 2 3 Replies 50 Views 5K Dec 27, 2025
Amsoil is a high end high quality synthetic based line of lubricants; it has many direct and indirect competitors. With that in mind, you need to understand that "synthetic" lubricants are much better at longevity of service, but not necessisarily better at protecting your engine. Look over many of the hundreds of UOA's here on this site.
Contact Amsoil they will give you the correct answer. I use Mobil 1 ATF in everything but the Dodge. Well Amsoil recommends their Multi Vehicle ATF for ATF 4 applications, and their Fuel Efficient ATF for Toyota WS applications. This doesn't stop others from debating the ATF 4 compatibility though.
Amsoil doesn't encourage extending OCI without UOAs, or in severe service conditions. They also recommend regular filter intervals and there are qualifications on 100K cars. I don't do super extended changes, but their recommendations, if followed, are sound; there are several 20 27K miles OCI documented on this site.
In this video this is a work van with 82000 miles and Amsoil has been the only oil used besides the oil the truck came with new. The person who made the video was doing some comparison with Valvoline Restore and Protect and I guess thats why he made the video. The video gives me confidence that an extended drain oil interval is safe to do.
Can anyone tell me what makes amsoil signature series so great? Anyone able to explain why? Is it marketing ? I’m genuinely curious if this really is so much better then say Mobil 1, Castrol, valvoline etc. any body have an oil analysis of the 0w 20 signature series?
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