QUOTE(chemistry @ Feb 19 2017, 04:26 PM)
48hrs done.
Thanks, Chemistry.
My quick amateurish guess, subject to challenge by the experienced, hands-on AND learned members........
and being overthrown ..... hehehe
a1)The Centre Zone (assuming 8 mm diameter at centre/point of blot deposit ) is transparent/translucent meaning not opaque and slightly grayish indicating deposits of (heaviest portion of) high molecular weight rubbish like combustion carbonaceous byproducts/insolubles/wear metals Fe Cu /resins etc etc .
a2)Good news is..... this 8 mm Centre Zone is not sharp and clear;it's not opaque; and colour is not very dark carbon black (hitam manis) and 8 mm perimeter line is not clear and sharp and shining yet.
b1)The Diffusion Zone of ( Outer Diameter max at say, 30 mm ) AND (Inner Diameter of 8 mm) .......
actually it is an annulus enclosing the Centre Zone ......
is generally lighter colour than Centre Zone .....
because the dispersants in oils take lighter weight rubbish like combustion byproducts/resins etc (of lower molecular weight) in an outward direction as the oil is travelling/seeping away from the Centre Zone.
b2)Good news is this Diffusion Zone is not darkish and its expanded Outer Diameter OD the bigger the better (in relation to the size of Centre Zone ), assuming a known quantity (in drops?) is constant.
c) Refering to postings in my Bitog thread, your 48 hour Blot Spot is what they call 'there is no structures' or 'the structures are very light and mild' ...........
meaning the used oil sample had been holding up well, whatever its mileage of xx km, and is still in continuing serviceable condition.
d) SonofJoe would call it in the midst of Phase 1, whereby he too commented (in primary/secondary stages of ... i.e in my classification )Phase 2 is deemed good.
e) I would 'speculate' that after you add another few thousand kilometres of use in this 10,912 km sample , 'some' members from Bitog might still classify it as Phase 1, though another may say it's Phase 2.
f) Several purely 'technical' and 'physics' commmentaries by several experienced members from Bitog (who had actually personnally do and evaluate the 'job' by their own physical 'hands and fingers' whilst referencing materials in the web .......
may form a solid basis for you to consider and making assessments and finally making your own call.
Do consider and just take comments from 'arm chair' commentators carefully (to avoid being confused) , and in certain cases, with a pinch of salt....... typically in www ....
g) One thing is certain, your engine has no glycol contamination problem and no severe fuel dilution problem, as yet.
So, should you replace this 10912 km used fullsyn Duron XL 0W30 immediately ????
Well , that's your call ..... adopting/abandoning certain 'opinions' and 'suggestions' along the way.
I had been keeping going ... on and on ....
until a day/mileage where I'm not comfortable with the onset and appearance of a 'very sharp and dark black hitam manis and opaque' Centre Zone ......
which I believe I had yet to see it in my 12238 km sample of semisyn Quartz 7000 Energy 10W40.
To each his own !!
Just my 2 sen
This post has been edited by zeng: Feb 19 2017, 06:28 PM