Oils (I know, I know)

So I was at FAST this weekend, to order a chain slider. I figured I may as well do an oil change as well

Book Recommends: POWER SYNT 10W50

Shops only have POWER SYNT 10W60 or CROSS POWER 10W50.

So I did some looking.  First of all, even on the can, Cross Power actually has a higher API spec (SL) to the Power Synt's SJ.  (This is specific to the Power Synt 10w60 though, the 10W50 product online, has a higher API rating of SM)

I managed to find online Data sheets for the Cross Power and Power Synt 10w50 products. They are identical.  So I think I'm gonna go with the Cross Power because I cant seem to find the Power Synt of the correct viscosity.

https://www.motorex.com/fileadmin/_pim_product_sheets_/en/CROSS_POWER_4T_SAE_10W_50_JASO_MA2_EN.pdf
https://www.motorex.com/fileadmin/_pim_product_sheets_/en/POWER_SYNT_4T_SAE_10W_50_JASO_MA2_EN.pdf


I seriously wonder what the workshops use?  I'd always rather use what's recommended in the manual than change viscosity.

I know I can use a bunch of other oils. Just want to stick to Motorex for now.