Hi Bro ,
These 72 hour blotter spot test pictures should have been 'matured' by now , and it clearly demonstrates they are free of (or lack of) structures or zones like centre zone ; aureole zone /perimeter ring and diffusion zone which are good news as it indicates the superb condition of this Syntium 3000 5W30 used oil at 6,500 km .
Generally, the diffusion zone is very transparent and light yellowish in colour indicating very low levels of combustion by-products or contaminants .
The jagged edge is not darkened , indicating a very mild or negligible level of water moistures which is of no concern .
Yes, this blotter indicates 'severe' level of fuel dilution by looking at the very visible translucent annulus of 80 mm and 65 mm diameters on my screen (of Right Hand Side of Top picture measuring in North/South alignment) .
This 'severe' level of fuel dilution is somehow not reflected in your so-called engine oil level increase .
IMHO, this 6,500 km used oil is fit for continuing service and IME 10,000 km is a non-issue and poses no problem whatsoever .
Is the oil changed ?
Edit: IIRC, Mazda3 OEM recommended oil change intervals is
10,000 miles (16,000 km) in U.S. for a 2013/14 .
Hi bro. Thanks alot for your reply and comment very much. Now i am confident that this Syntium 3000 is good to go until 10k km. This oil is not change before and infact this is my first time to use this syntium 3000 in which previously i tried mobil 1 ep and shell helix ultra 5w30 (ACEA A5/B5). As for the syntium I suppose it is a ACEA A3/B3 oil? Since its never stated (only SN plus/GF-5)