chase3

iTrader: (1)

i currently have mobil 1 5w-30 fully synthetic and have head from posts on here that it loses its wait very quick..didnt think much of it...i have put 5k on this oil now and my oil pressure is much lower than when the oil was fresh.even at idle....i think im going to go with amsoil..have heard that that doesnt happen with them..atleast not as fast.. INFO???

THANKS

DJ's 02' Z28

iTrader: (2)

I have Mobil 1 10w-30 and have never had a problem, and I drive the **** outta my car!

Rick99TAWS6

iTrader: (4)

Mobil 1 has slipped in quality, others have taken the lead..... I use German Castrol(almost out though and cannot find it anymore) and have heard good things about Pennzoil Platinum

chase3

iTrader: (1)

yes i have heard that the german castrol is a great oil for the ls1 but i just cant seem to find it anywhere

carbonfiberbird

iTrader: (4)

all I use is Amzoil.

dailydriver

Pep Boyz just stated carrying the GC.
They even had a sale on it already.

The Mobil 1 extended performance, or high mileage 5W-30 does not shear/fall out of grade as much nor as quickly as the regular old 5W-30 M1.
Their EP/Euro 5W-40 is good as well.

Another great, decently priced 'off the shelf' oil for LSxes is the Shell Rotella 5W-40.

chase3

iTrader: (1)

thats what im running is the extended performance...when i first put oil in and motor was warm i had just over 40 psi at idleand 70-75 WOT ..now 30-35psi idle and 60psi WOT

BriancWS6

iTrader: (18)

If your wanting to run the Mobil 1 line, use either 5w40, or 0w40.

Anan A.

I use Mobil 1 5w30 and don't have any issues... but I change my oil at 3-3.5k miles... I'd rather be safe I guess.

That and I don't drive to far so I'm usually two months before a change or so depending on if I decide to take a long relaxing cruise or something like that.

VaderZ

iTrader: (3)

i use mobil 1 10w30 and it works good for me.

*98TransAm*

royal purple is good ****, or you could search this forum and get everyones opinion cuz this topic has been brought up like 3,000 times.

curtisad

iTrader: (4)

Royal Purple all the way!!

mikenews

iTrader: (9)

Mobil 1...never had any problems. Run it in everything I got. Change every 4k in lS1, but change every 10k in 03 corolla and in 05 impala.

donalr76

German Castrol Syntec 0w-30w is all I use and I have no problems and I am on my second motor.

sappy96

iTrader: (1)

well, I decided to alternate between Royal Purple 5w-30 and Mobil 1 0w-30 mixed w/ lucas full synthetic.

Blackhawk777

I just went from mobil 5w30 to valvoline high mileage synthetic blend. MUCH better pressure now.

EDIT: Forgot to mention it's 10w30 with a little bit of lucas oil stabilizer. Great pressure and is holding up well to the abuse it sees regularly.

Reject

iTrader: (24)

i run rotella 15-40

https://ls1tech.com/forums/forced-induction/884250-fi-engine-oil.html