QUOTE(chemistry @ Jun 30 2018, 05:52 PM)
Dear zeng,
Appreciate your opinion on this 48-hr blotter spot image. Thank you.
Car make: Nissan AD RESORT 1.6L (Carburetor)
Engine oil: Petro-Canada Duron SHP 15w40
Oil mileage: 11,145 km
Engine total mileage : 295,388 km
Driving condition: 90% stop-go , 4-5 times engine on/off daily
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QUOTE(zeng @ Jul 2 2018, 08:56 PM)
Hi chemistry,
This 48 hr blotter spot has a very large centre zone , but without a clear ,dark-coloured perimeter ring around the centre zone (which is a good news) indicating a very potent or strong dispersancy (and detergency) capability typical of a modern HDEO diesel oil.
Btw, this PC Duron SHP 15W40 is a semi-synthetic HDEO with ultra high specifications in CK4,E9, ECF-3, other than dual rated SN.
The rather grey colour of the centre zone indicates quite an amount of combustion by-products and contaminants etc in this 11,145 km used oil sample from a carburrettor old tech engine.
The intermediate diffusion zone is good and clear.
However, I find it interesting for being unable to 'see' the outermost transparent zone surrounding the jagged edges, indicating near zero fuel dilution despite your claim of 90% stop & go traffic condition.
It appears to me this engine is very well maintained.
This used oil sample appears to be serviceable for probably another 1500-3000 km , IMHO or speculation.
Update:
Car make: Nissan AD RESORT 1.6L (Carburetor)
Engine oil: Petro-Canada Duron SHP 15w40
Oil mileage: 12,558 km
Engine total mileage : 296801 km
Driving condition: 90% stop-go , 4-5 times engine on/off daily
@zeng : Appreciate your review on this 72-hour blotter spot. Anyway, I am changing the oil in a few days.