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Originally Posted By: badtlc Dilution can be reduced in these engines. My uoa showed no signs of it with the same engine. I switched to premium fuel (91 octane) in my last oil change interval on a skyactiv, and my dilution% went from 3.3% (with 87 octane) to TRACE. Might be something to that...

Originally Posted By: webfors Mazda needs to solve their fuel dilution in these engines. Great concept with a 13:1 compression ratio on regular for increased mileage. But this is the result... and I suspect the mileage is not as good as they claim as a result of running these engines so rich...

Originally Posted By: webfors Originally Posted By: vincegt Update to OP: I switched to premium for the entire oil interval, and my dilution is down below measurable levels. Blackstone didn't have an explanation as to why that might be, but admitted it looks like whatever was causing it has gone...

Update to OP: I switched to premium for the entire oil interval, and my dilution is down below measurable levels. Blackstone didn't have an explanation as to why that might be, but admitted it looks like whatever was causing it has gone away. Not likely to occur with a mechanical issue. Looking...

Thanks for the feedback @k24a4! I've had both changes done right after my commute home; about 20-30 minutes largely highway, with a few city miles at the end. For this most recent change, the shop was empty, so I rolled right in w/o shutting off and the guys were draining within 5 minutes.

I'm seeing high fuel percentage in my UOA from Blackstone. This car resides garaged in San Diego and is primarily a highway commuter or long roadtrip car; not exactly severe usage. I'm concerned about potential buildup on the valves since this engine is DI. I know Blackstone's flashpoint...