I'm a believer in Auto-RX even though I'm 80K past its treatment. It did treat a seeping rear main and when I pulled my valve covers last year my internals were clean with the usual film of varnish.
It's the only stuff I feel comfortable using to clean an engine up. I'm about to use it on a 2004 Hyundai Santa Fe that may benefit from it.
It's the only stuff I feel comfortable using to clean an engine up. I'm about to use it on a 2004 Hyundai Santa Fe that may benefit from it.