We race a class 5/1600 race car. We us the 25/50 racing oil supplied thru Greg Crew, Crew Racing. We ran our engine a unbeliveable 9 races with no teardown. Our engine builder Lee Leighton who has 35 years in the business could not belive that the bearings were not hammered. He said it must be Lucas. FYI, this is a 36 horse engine pumping out 80 horse at 12.5 to 1 compression. Also I sell your products thru Greg Crew, We restore automobiles and Lucas products are only liquids that go in our personal, race and customer cars. Thanks Lucas