[HotLegend87]

I've been to NAPA Auto Parts a few times and stopped to read the back of a can of Engine Restore. It says that it will restore lost compression and horsepower of an old engine. Is this true? Does it actually do this to any extent? Thank you in advance.

 

[cdndvl]

Dunno about compression...

A lot of guys here... Me included have found that it works for quieting the valve noise from clogged lifters, but I'm not sure about it restoring compression... I didn't notice any difference with that.

 

[colinc]

I heard that all it does is thin out the oil like all the other similar products. I used it a while back and didn't really notice a difference.

 

[ladelberg]

Yeah, I got an additional 10HP with it. Fills all the little scapes the oil goes through (hogwash!!!).

It made a significant difference in the noise level of the valve train, that's all I noticed. I guess, theoretically, it could make a difference in power but then theoretically, Mike Tyson could be sane.