It does seem like modern oils do a good job mitigating wear despite fuel dilution. I still would rather not have high fuel dilution. I guess the Honda 1.5T is a good example of an engine being able to last a long time despite high fuel dilution.
This is from Amsoil:
This is from Amsoil:
Why is fuel dilution a problem?
- Reduced oil viscosity interferes with formation of a durable lubricating film, inviting wear. It also negatively affects the oil’s ability to function as a hydraulic fluid, which is critical in engines with variable valve timing
- Fuel can wash oil from the cylinder wall, causing higher rates of ring, piston and cylinder wear
- Reduced effectiveness of detergency additives limits the oil’s ability to guard against deposits
- Increased oil volatility results in higher oil consumption requiring more frequent top-offs
- Accelerated oxidation reduces the oil’s service life and requires more frequent oil changes"