jessebuickguy

iTrader: (1)

I used the search function but to no avail, (only info for LS1). I'm currently using Royal Purple 10w-30, and the more I read on this site about oil, the more I hear about German Castrol 0w-30 being the best and M1 and Royal Purple far behind. So is the GC the best oil the run year long. Thanks

Hambone 7

I've always thought that Royal Purple was about the best. To pricey for me though, I wont put anything but 10-40 Penzoil in my engine.

Speed Density

iTrader: (38)

Penzoil 10 30

carzman5678

Castrol 10W-30 Syntec for me

3pnt4maro

iTrader: (2)

will it hurt if i switch over from what the previos owner was using...the pennzoil 10w30..to a synthetic oil...just wondering since we were on the topic..i have heard multiple things including synthetic could cause leaks

buffman

iTrader: (9)

I'm not much a fan of Penzoil.

if the synthetic route I recommend Mobil 1. Now 5w30, and 10w30 are just fine but realize the formula anymore is on the thinner side and more or less resembles a thich 20weight. the 0w40 and 5w40 stuff from Mobil is found to work really well. I think the best in terms of wear numbers is the german made castrol 0w30

BizZzatch350

iTrader: (33)

It all leaks out I use Mobil 1 15W50

transam5.7lt1

iTrader: (18)

I use 10-40 Synthetic blend from Quaker.....

fabgmc4me

iTrader: (5)

I have always used Mobil 1 Fully Synthetic 5w30. I only drive the car in the summer.

Cammed95Z28

Good ole Castrol 10w-30 all its life.....Both of them

infinitebird

iTrader: (11)

mobil 1 0w40, or 5w40 for me

aintno6

We have to change our oil??????????????????????????? Ughhhhh Ohhh...........












ROFL JK!

Physics

http://theoildrop.server101.com/cgi/...c;f=1;t=010399

That forum is the best place to learn about oils and oil filters.

dhdenney

iTrader: (53)

That's the oil I use. I don't think synthetics are so much of a problem switching from conventionals except that if you already have a leak, it can potentially be worse.

01WS6/tamu

iTrader: (37)

I have ran Amsoil 100% synthetic in my truck forever. The bird is almost through and I am breaking it in on 30wt for about 3000 miles and then I guess go ahead and put amsoil in it. This is my second lt1 the first I had in an s-10 and ran the amsoil in it. Two optis, and two intake gasket sets later it has 220,000 and the bottom end is still quiet. Most all modern day oil is good stuff. It all has to meet sae and api requirements. So as long as you change it frequently you should be ok. I have seen a lot of nasty pennzoil ran engines though through the shop. It could just also be people not changing oil though.

bigj2717

iTrader: (15)

i use royal purple but it is pricey

streetwarrior96

Penzoil Synth . I use straight 30 cause of the heat down here

Charging TA

Hmm... I was hoping this thread would have info for me, but I dont want to go Synthetic, any recommendations? Im in Finland, but the cars only driven in the warm weather.

LT1MAN

iTrader: (6)

i have always put fully synthetic mobil 1 5w-30 in both my camaros

Mike Comp T/A #57

Mobil 1 0W-30 synthetic