2000 Ls1, 80,000 Miles. I Don't Know What The Previous Owner Used But I Have Always Used Synthetic. I've Heard Of Problems Using Synthetic Too Late In The Game And People Have To Go Back To Conventional. Is There Just A Bunch Of B.s. Myths Out There? I Tried A Search But Its Taking Forever On My Computer.

 

ive always used syn motor oil ( mobil 1 full syn 5w30 )

never heard of or had any problems myself w/ usuing it
but im kinda new @ here. hope this helped some tho

 

Thanks I've Always Figured Its Not A Problem. I've Only Owned Used Vehicles And For What I Know, Was The Only One Using Synthetic.

 

mobil 1 is what the car had in it out the factory . i have always used synthetic on my ta anyways.
there are myths out there that people say once you use one you can not use the other but oil is oil . sure some dude might of blown his engine after an oil change but to blame it on a different brand of oil does not make a lot of sense .

try to do a search for a member by the name of PATMAN . he is the oil guru or at least he was cause i have not seen him in the postings but that dude knows oil .

 

i bought my z28 at 53000 give or take a few miles, as soon as i got it i put in penzoil platinum full synthetic 5w30, no problems, doesnt burn any, change around 3500 miles and the oil is still a light brown color. my sisters 2000 v6 camaro turns conventional 5w30 penzoil black in 3000 miles.

and for the record i had some engine work done on my car and my mechanic put in mobil 1 conventional 5w30 and i ran it over 600 miles then switched back to the penzoil synthetic, no beef what so ever

 

Thanks for the replies. Theres always someone making me second guess my decision when it comes to oil.

 

i ran castrol gtx 10w-30 on my 2000 z28 and had no problems of oil consumption or anything.. car ran perfect. i now have a 2002 z28 and running castrol syntec 5w-40 and still no problems, or oil consumption.. i dont think it matters as long as your keeping up with the maintenance you should be fine!