for those of you who have read my post on their fuel additive you know this stuff works great for me. however i have done some reading and found an interesting fact that those of you on tdr who are concerned with the whole cj 4 oil and want the older stuff. maybe you should look into schaeffers line of oils. i was just reading about their supreme 7000 and its ci 4 ci 4 plus rated which is what ya'll are looking for. anyways just thought id let ya'll know about this product.