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I was reading through some R&D papers that Honda releases on their website and thought people here would be interested in it. FYI, this is probably gonna be a very long post. TLDR: Fuel sticks to cylinder walls and ends up in the engine oil. Since you can't post PDFs on BITOG, here is the...

This is the filter off my latest oil change on my Mazda CX-50 2.5S. This filter had 8043mi on it when I took it off. The oil was Mazda 0W-20 GF-5. Overall the filter looks quite stout and held up quite well. UOA Link: 2023 Mazda CX-50 2.5S - 8043 Miles- Mazda 0W-20

This is the first oil analysis for my 2023 Mazda CX-50 2.5S i.e. the naturally aspirated 2.5L engine. I was able to pull quite a bit of data using the OBD MX+ scan tool and I will discuss that below. The oil in the sample was from the complimentary oil change that came with the vehicle purchase...

Filter came off a 2015 Honda Civic 1.8L CVT Filter Interval: 6612 miles and 1 year (7/30/22-7/30/23) Oil Life was at 10% when removed. Anti-drain back valve was still very pliable. Media looked good and I didn’t notice any tears or manufacturing issues with it. Overall, very impressed with...

Came off a 2015 Honda Civic 1.8L CVT Filter Interval: 6057 miles and 1 year (7/31/21-7/30/22) Oil Life 20% Anti-drain back valve was still holding oil in after a year and a half of being upside down and was still decently pliable. Filter media looked good, didn’t notice any tears in the media...

Did my first analysis on my wife's 2015 Honda Civic. When I changed it, the OLM was at 10% and had been exactly a year since I last changed it. This car is mostly short tripped and I didn't give the oil much time to warm up before I changed it. So unsurprisingly, there is fuel in the oil but...