Slipping clutch.

[motormouse14]

Good morning to all. I have a 2009 TMax with 13,000 miles. I am the second owner. I bought the bike when it had 6,500 miles on it. I have always changed the oil around 1,000 to 1,500 miles using Castrol GTX 20w50. This season I noticed my bike is slipping under acceleration. From 0 to 30 it slips. After that it seems normal. I changed the drive belt hoping to cure this problem. It did not. I have read about Automotive oils having additives in them that possibly contribute to clutch slipping. I switched to Yamalube 10W40 mineral oil. I did two changes at 50 miles. The clutch still slips. I guess my next step is to change the clutch friction disks and plates. It just seems like low mileage to have to do this. One person I talked to said switching to the Motorcycle oil will eventually help the clutch. Hoping to get some opinions from the group. Thank you in advance.

[aeroxbud]

If you have used car oil in the wet clutch it will slip. Modern car oils are not suitable for motorcycles. They have special friction inhibitors which will wreck a clutch.
I fear you might have to replace the friction plates of it wasn't slipping before the oil change.
Brent did do a video of the clutch.

[motormouse14]

Thank you for your reply. I wasn't sure how to post this.