When i get mine i may just go mid grade fuel.

 

i"ve been using 87 octane for almost 4000 miles and average 28 mpg. No ill effects -- pinging, lagging, etc -- noticed yet.

 

ALLLRIGHT this thread is dead a burried lets move on to something better to talk about.

 

I only use regular on my 2LT

Ng

 

I went to one of the two gas stations around here that sell 100 octane a couple of weeks ago to fill up. They stopped selling it so I had to get 93. I still have one more gas station to try. Hopefully they still sell it because I want to give it a try in my HHR.

 

I've been using AvGas with great results!

 

lrg760

From what I have learned, synthetic oil reduces the friction so theoretically (sp) the car should spin easier. This means better gas milage, more power, and less wear and tear. In todays new cars that have fewer scheduled oil changes, synthetic oils break down slower, so they last longer.

In short, most everybody recommends them. (Unless you change your oil frequently, then it wont be in your engine long enough to be worth the cost.)

 

On the flip side, synthetic oil does not prevent metal shavings from depositing in the oil so longer oil change interval may mean more metal shavings. That is why I've heard no change to synthetic until after 10K miles... although my SAAB came with Mobile 1 and no scheduled oil change until 15K. Good thing I leased it!

 

I've always used penzoil. Never had a problem

 

Actually the reason for the 10k recommendation before switching to synthetic has nothing to do with metal shavings, this is actually to allow the piston rings and cylinder bore to properly break in. Synthetics are so slipery that there's a possibility of this not happening. The car's that come from the factory with syntherics already in the engine use a different cylinder honing process and the engines are "Broke in" before they leave. On a new engine you may see some metal in the oil but most of this is large enough to be trapped in the filter, after the initial "Engine Break-in" you shouldn't have any metal in your oil at all, if you do you have other problems. The whole purpose of engine oil is to maintain a thin wall of oil between ALL moving components so there should never be any metal to metal contact. It also holds contaminants in suspension to be flushed out with an oil change. If you are using a good filter there should be no particles greater than 5 - 10 microns flowing through the engine, anything larger should be trapped in the filter. These particles are so tiny that they should be able to flow with the oil and still be too small to allow interference to the moving parts.