For oil, I think I'm going to go with Rotella T5 10W-40. I have read a lot of good things about Rotella on this forum.

I'm probably going to buy:
This oil will work great with this bike, right? I was trying to find what the OEM oil is but I don't have the manual so I'm not completely sure.

Going with the OEM filter, might try K&N in the future, but not this time.

 

That rotella is the synthetic blend version. Check the price at walmart, I think it's cheaper than $20/ea there.

 

The guy I bought the bike from isn't sure if he used synthetic or regular oil.

If he used regular and I put in synthetic, is it going to cause problems? I thought I would play it safe with T5 because it's a blend.

10W 40 is the correct type right? I'm still trying to understand what those numbers means.

 

You wont hurt anything.

There are MANY threads on oil and weights. Read up on it there.