finally took the plunge and when i changed my oil i used the synthetic oil. how many  of you have used the synthetic and what is your opinion of it?

For the LT1 Chevrolet specifically calls for synthetic oil.  All I've ever used is Mobil 1 with no problems.

As Dan said Mobil 1 is the factory recommended oil for the LT1--that's all i've ever used in the Vette. I also use it in a V8 Grand Cherokee (went with synthetic at around 90K miles) and in my GMC pick up (went with synthetic at 50K) no problems w/any of them. The only problems I've seen are with engines that are using/leaking oil be it valve seals/guides/rings/gaskets or rear main---synthetic will find it's way out of the engine quicker/easier then conventional oil.

As  Vaughn says, synthetics do have a tendency to find any small place it can to leak. The smaller molecules of the stuff just naturally wanna seep out anywhere they can. If you have a leak now, it'll get worse/bigger with synthetic oils.
Other than that, the only real drawback is the cost! That can be off-set by the fact that synthetics will handle heat much better without breaking down, so they do tend to last longer while still being effective.

basically it was only about $10 more. a guy i know with a 95 was talking to me about it so ifigured i would breakdown and try it. went with penzoil as he stated he has had no problem with it and has always had good luck with it. i can understand the advantages of it but i hate it when some shops push it on people and charge them twice as much for it especially if they cant really  afford it. eddie208902010-07-02 18:29:18

Believe it or not; you should see an increase in fuel mileage.

Read and re-read Vaughn and Joel's message for correct *negatives* of synth oils....especially since Vaughn mentions the valve guides....rings and cylinder walls too. 



GL
Jim