has anyone used any of the lucas oils before our local sales rep that comes by the shop where i work is trying to get me to switch from belray to lucas has even offered to give me a case for free to try it out. he said if i would try it that he would pay to have my sons motor rebuilt if it caused any damage. we use a lot of the other lucas products at my shop and ive known the rep for years. im thinking i might give it a shot as all the lucas products we have used over the years have been very good. what do you guys think worth a shot?