Yup, just enough to eliminate any chatter, be it synthetic or dino oil. Most of the oils on the market have the additive already in at about 5% anyway. So far of the ones on the shelf at 5 different parts stores yesterday, I only found 1 brand of 80W90 (Coastal) that was not LSD-compatible (said for top-off only), though there was some Castrol at one store that said nothing at all about LSD compatibility. I could get some of RedLine's NS-type, but I don't feel like waiting or coughing the $ just yet.

Brent