I used to have a 2008 impala SS and came across this thread years ago in the LS1tech forum. http://www.ls1.com/forums/f48/been-testing-oil-91206/. Has anybody tried this in there SHO?
2 stroke oil as a gas additive ?
- Thread starter qxjm76940
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Should have updated with my personal experience a little while ago 
Using TC-W3 1 oz/4 gallons during the winter fuel months. Smoother startups, quieter running, a little increase in MPG over 4-5 tankfuls. No harm done to spark plugs.
Have not used since summer fuel hit. Summer fuel by itself def makes a difference, but the engine is still not running quite as well as winter fuel + TC-W3.
Realize that this experience is on a PFI engine, not a DI engine, but it shouldn't hurt to try if you want. I used Walmart brand SuperTech (bought by the gallon, very cheap), and it worked well. Measuring & preparation with a funnel was the hardest part. I bought graduated beakers to help with that, I guess you can eyeball the amounts. The usual recommended ratio is more like 4 oz/20 gallons of fuel. I saw more results with 5 oz.
Using TC-W3 1 oz/4 gallons during the winter fuel months. Smoother startups, quieter running, a little increase in MPG over 4-5 tankfuls. No harm done to spark plugs.
Have not used since summer fuel hit. Summer fuel by itself def makes a difference, but the engine is still not running quite as well as winter fuel + TC-W3.
Realize that this experience is on a PFI engine, not a DI engine, but it shouldn't hurt to try if you want. I used Walmart brand SuperTech (bought by the gallon, very cheap), and it worked well. Measuring & preparation with a funnel was the hardest part. I bought graduated beakers to help with that, I guess you can eyeball the amounts. The usual recommended ratio is more like 4 oz/20 gallons of fuel. I saw more results with 5 oz.