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Just curious. What do you quantify as ‘good results’?Have used their oil additive in several cars with good results. What's the general opinion on Blackwing use??
Yeah, they saw intake valve coking Bigly and damaged failed cats very early on? Both of which would cost GM much money in warranty so they had to the next cheapest thing? Change the oil spec....Just curious. What do you quantify as ‘good results’?
OEM for me. The fact the GM revised the oil spec halfway through the LT1/4 production run verifies they saw something that needed to be addressed and did it.