We all know here that most Lucas products are garbage, but what about the synthetic oils they offer such as the 5W30 and the 10W30? They both have the API donut on the bottle. But do they really meet all the specs that they claim? I noticed all of Lucas products have a lot of phrases and advertising on each bottle, gimicky if you ask me. How about the 15W40 high TBN long drain diesel oil, is it any good? Reason I ask is because I can get Lucas products at a good price through my job.