QUOTE(incredibless @ Aug 18 2019, 03:40 PM)
Hi Zeng. Any comments on this oil?
Mazda 3 2.0L Skyactiv
Current Odo : 98k+ km [due in around101,000km]
Date: 18/08/2019
Blotter time : 9am [picture taken 3pm] after approx 6 hours
oil age: last oil change is 91k km [March'19]
Engine oil used: Mobil 1 Extended Performance SN.
Type: 5w-30
Driving condition 60% city 40% highway [sometime highspeed revving.
Fuel used: BHP Ron 95
Can this oil last till my service due? I am a bit worried as most of the member posted is in golden color. Wondering this Mobil 1 ep oil is suitable? Been using 2nd time already.


Hi incredibless,
The gray/darkened colour we see in this 6 hour blotter spot indicates there is presence of soot and combustion byproducts in this used Mobil EP oil, traveling outwards away from the 'centre zone' of about 8 mm diameter size.
With a 48 hour blotter spot later, we would be able to see clearer whether the oil detergency/dispersancy capability has badly deteriorated such that the centre zone is darkened and opague with possibly a dark-coloured perimeter ring surrounding this centre zone. This indicates oil life may be used up and require replacement depending on severity of black spot in the centre zone .
If the centre zone at 48 hour is light yellow/brownish, translucent and not darkened and opague, it indicates the oil dispersancy capability is in top form and likely fit for continuing service.
From
Post #1So it would be nice to wait till the blotter spot 'matures' after 48 hours of drop to better ascertain the 'fitness' of the used oil.
Edit:If I must guess with a quick interim answer, in my experience, this used oil should be good to last until your next scheduled oil change at ODO 101k km.
This post has been edited by zeng: Aug 18 2019, 04:17 PM