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if BlackStone shows 2,5% dilution, backed up by low viscosity, chances are dilution is 5%+

Blackstone is well known as unreliable source for fuel dilution checks. There are references that they basically derive fuel dilution from flashpoint test. You can just ignore it and if you smell gas in oil - send it to Oil Analyzers. Please see my experience below: Post showing differences...

Missed this thread? So my issue is back. It took some time to validate due to COVID apparently... After the "leaky injector change" oil smelled ok after first 1k. After that I did not check much. Got another issue with engine harness and had to tow it for repair. At 3600k on oil I send it to...

Once I got first analysis with 5% in 3500: I changed oil type, switched from Regular to Premium and did at least 70% highway driving and on top of that it was summer instead of winter. And I got 3.8% fuel in 2100 miles anyways :) I think something happened around 6-8k After first oil change...

There were many cases where car manufacturer declares lifetime ATF fluid, but gearbox manufacturer declares 40-60k miles :) Do Mazda use their own transmission or 3rd party?

For bad roads 18" is an easy choice :) It's simply better for your car on the long run.

A heads up for those who prefer Blackstone and gets low viscosity. I would recommend testing with OilAnalyzers as they actually check for fuel in oil. Sample below showed 3.8% from OilAnalyzers and no fuel with Blackstone. I left a note in comments that fuel dilution is suspected. The car...

One more point on labs. The Blackstone is very popular lab, but they don't do proper fuel dilution analysis even though they provide the "Fuel %" value in the report. They simply derive it out of flashpoint test. Their staff seem to think its a reliable test. I have send my previous sample with...

Heh, I did a trip to another dealer and that experience was like from another world. I never thought you can get that much of variation between two same brand dealers 20 miles from each other. Seems like the first dealership does not have anyone proficient enough to do anything other than simple...

Made a trip to the dealership. As I expected, they were useless. They wanted to get away with oil change :) They asked questions like: "Why do you think it's an issue..." "What is the Mazda spec for viscosity... it is degrading over 5k interval anyways" When I asked for some diagnostics for...

OK, 3.8% in 2.1k. Difference: 1 sample: - winter, jan-june - 60% short, non-highway trips - Regular gas Oil level dropped alot after first 2k. Had to add 1q, then stable. Never seen it going up. 2 sample: - all-summer - 70%+ highway - Premium gas Oil level possibly a bit up at the end...

deeplink didn't work for me

Same thing, invisicord pins seem to thick to push into harness plug. Barely half in and ended up securing it with tape.

I probably misspoke. I don't consider GTX Magnatec bad (i would not buy it if so) and by cheap I did mean one of the cheapest top-brand options in Full-Synthetics. And therefore I did not expect any margin from it if anything is not good. In comparison, there is some consistent evidence on WRX...

got a not very promising analysis: https://www.mazdas247.com/forum/showthread.php?123867122-2-5-Turbo-Oil-Fuel-Dilution-Issues&p=6647360&viewfull=1#post6647360

For a non-boxer turbo 40k interval does not look like an issue at all... My '15 WRX has 60k interval for spark plugs. But its worth changing early. I stretched it to 60k and got ~2 mpg jump and better idle when I finally changed them.