OIL - Conventional vs. Synth Blend vs. Full Synth

**transAMchubby** · 10-01-2007, 09:16 AM

What do you all reccomend as far as conventional oil or synthetic oil, or synthetic blend?

My '99 T/A (LS1 M6) has 90K miles on it, does not burn oil, but does have a small leak. I'm planning on 10W-30 (as per Sarge's reccomendations). The previous owner doesnt even know if he used conventional or syn.

Would it make a difference if it has syn in it now and i switched to conventional? I've heard thats not so good...but i dont know.

**Danger731** · 10-01-2007, 10:50 AM

No difference as long as you change the oil and use a good filter. Synthetic blend is only partially synthetic. You would be better to use your own mix, say 3 qts synthetic like penzoil platinum and the rest a good dyno oil. I'm at 105 k and I use my own mix. I started with regular dyno oil.

**Sarge** · 10-01-2007, 03:03 PM

Whichever you utilize...synthetic or conventional....AutoRX that motor first.
Many a leak has been cured due AutoRX...it really cleans and conditions the seals and all internals best I have seen......when the seals have been cleaned and conditioned they ...well....they seal.....what a concept huh?

Follow the instructions to a T....
http://www.auto-rx.com/

**transAMchubby** · 10-01-2007, 03:33 PM

is it true that you are not supposed to switch to conventional oil if you are already using syn?

and if i do not know what the previous owner used, is there a way to find out if it is conventional or syn?

**blue02Z** · 10-01-2007, 05:22 PM

can-O-worms you opened buddy

**clg82** · 10-01-2007, 05:30 PM

Originally Posted by Sarge

Whichever you utilize...synthetic or conventional....AutoRX that motor first.
Many a leak has been cured due AutoRX...it really cleans and conditions the seals and all internals best I have seen......when the seals have been cleaned and conditioned they ...well....they seal.....what a concept huh?

Follow the instructions to a T....
http://www.auto-rx.com/

i heard that stuff ruins your seals, is that true or not?

**transAMchubby** · 10-01-2007, 05:43 PM

Originally Posted by blue02Z

can-O-worms you opened buddy

any help is greatly appreciated! im trying to get her in as good of shape as possible before i drive back to school for homecoming. i hear the ladies this year are real nice!

so is this AutoRX availible in autozone or o'reiley's? or do i have to wait for it to get here in the mail?

**blue02Z** · 10-01-2007, 06:09 PM

Originally Posted by clg82

i heard that stuff ruins your seals, is that true or not?

negative, it is a non abrasive cleaner. it conditions your seals. that is why it takes 1500 miles to work

**dreed2** · 10-03-2007, 07:16 PM

I've used nothing but Pennzoil's synthetic since I bought the Z28 new. I used the cheaper oil for the first oil change because I knew I had to change it again at 500 miles, but nothing other than Pennzoil synthetic ever since. The owner's manual calls for Mobil synthetic, if I recall. But the Pennzoil place is right across the street from where I work and I change it every 3,000 miles, so it works for me.