This issue is a constant consideration for many on this site, in any thread about "which oil to use".
Let's take a survey: Please state whether you
1. Are in strict compliance with what the manual states because you don't want to risk a warranty claim denial, and will continue to follow the recommendations once the warranty has expired
2. Use what the manual states coincidently because you agree with the recommendations therein
3. Use an oil other than what is recommended and don't worry/care about being denied a warranty claim
4. Comply with the recommendations while under warranty, but will use something different once the warranty has expired
For myself: 3