Did a search and really didn't find the info I was looking for. I'm right at 3000k on the new X and was wondering if you guys had some suggestioins on the type that I use. I'm not a big believer in the syn. My question is that I pull a 2500 lbs boat trailer frequently and was wondering if a specific type would be easier on the X. usually put in 10w-40 during the summers here in TX. Any suggestions?