It totally crapped out my saab's motor. It ran funny then for some inexplicable reason the oilpan drain bolt blew/shot out. Thank God the threads were still ok. Took 2 more oilchanges to get rid of it so it ran right. The lucas trans stuff gummed my T-5 and that took 2 changes to get rid of it. The t-5 went from grinding to REALLY grinding.
I been using it for 5 years in everthing. Never had a bad experience really worked wonders on a high milage 5.0. I use 1 qt w/ 4qts 10 30 and never had a prob.