its obvious we are not the only group deliberating the details of oils for our machines. A quick search turned up a bunch of car/truck/bike forums that are having the same discussion. I pulled this post off of one of those sites....www.bobistheoilguy.com. The poster is working at Shell


Re: ZDDP level of Rotella CK4? [Re: bubbatime] #4464048 07/19/17 01:07 PM
ChrisGuerrero Offline
Joined: Jan 2015
Posts: 86
Houston, TX
You can use our Rotella T4 15W-40 engine oil or Rotella T6 5W-40 (synthetic, good for high and low temperatures). These two grades meet the JASO MA specifications and are safe for wet clutches. Also the zinc is 1200 ppm in both. Thanks for your interest in Shell products!