- Joined
- Feb 23, 2024
- Messages
- 35
First time oil analysis on a 2018 Mazda 3 Touring 2.5 liter NA. Mostly freeway/highway driving. Purchased new in 2019 as a leftover. Only Mazda oil filters have been used. 1WPE-14-302. Initially the Mazda 0w20 high moly oil was used up to 25,000 miles. After that Quaker State 0w20 up to 45,000 and then the Valvoline Advanced 0w20. Decided to run the sample because I was concerned about the small amount of coolant loss and fuel dilution. I guess the fuel dilution is at a minor level at 4,400 miles and it appears no coolant intrusion.