BLKWS.6

I hate GC 0-30 because in my 5.0 it sucked a TON of it into the intake and it used it at a bad rate. Almost like M1 10-30. I want: A full synthetic oil that can be purchased at auto-zone/wal-mart and meets GF3/GF4 specifications. I want a weight with a 100CST of 12.6-13.5 and I would like 0-40 or 5-40 weight.

Sorry Patman, I just dont like GC. I have heard too many 50/50 posts and I myself didnt have any luck in my other car with it.

PS. when I bought the car it was QUIET! it had a really heavy oil. THis 10-30 syntec uses no oil, but tis a tad louder. I want something a bit heavier.

RPM WS6

iTrader: (3)

I've been very happy with M1 0W40.

No burning.

Engine noise reduced significantly over the M1 10W30.

Oil pressure up about 3-5psi over M1 10W30.

Autozone almost always has it in stock.

BLKWS.6

But its not the EXTENDED formula, I was lead to belive that only the 15K mile formula is true synthetic.

'Trust'

iTrader: (24)

M1 0w40 is fully synthetic, if you must get the extended formula do so.. however, don't keep it in there for 15k!! No oil filter I can think of that will filter for even half that effciently.

BLKWS.6

I would NEVER keep it for 15K, I just heard its a better formula, M1 claims they dont make it 0-40 in 15K though

BayAreaSS

iTrader: (10)

I've had the M1 0w40 for 1600k and i just added a little bit of oil today. Its performing very well compared to M1 10w30 and its not the extended version.

BLKWS.6

How much quieter is your motor tick/slap wise with it ^ ?

BLKWS.6

http://www.castrol.com/liveassets/bp...syntec_usa.pdf

I am using the 10-30 right now and DAMN, that stuff is thinner than I thought Help guys, what on that list would the LS1 like the most? (no wonder I have a minor minor sewing machine sound kinda,it wasnt a pushrod/rods, they ALL are doing it and this is why!! 10.1 @ 100*C !!!

RPM WS6

iTrader: (3)

Switching from M1 10W30 to M1 0W40 cut my valvetrain noise in half, maybe more. I don't think any oil will make the LS1 valvetrain 100% silent, every one I've ever owned/heard makes a slight sewing machine sound no matter what oil it's got, even when stock. But M1 0W40 will get the motor as quiet as you could hope for.

BLKWS.6

Syntec 10-30@10.1 CST @ 100*C is prolly what has paranoid me, lol. I will put some 10-40 Syntec in this weekend or so (CST 13.2@100*C)

bww3588

iTrader: (49)

hmm.....M1for me = ticking
GC 0W30 = quiet running LS1

BayAreaSS

iTrader: (10)

Its quite. Just your typical ls1 sewing machine

EarlSS

Im in the same boat but i'm running 5w30 so i'm realy paranoid. The worst part is I just had my oil changed

Revelation Z28

iTrader: (10)

dino oil.

your engine will run like a T rex afterwards lol

dailydriver

Yes, I know it's NOT a Wally World/Advance/AZ item, but if you're worried about the 100 degree cst you cannot go wrong with either Redline 5W-40 or Amsoil 5W-40. Short of that, the Pennzoil Platinum is great "off the shelf" non "boutique" oil, but I'm not sure of the 10W-30's cst (it's probably not as high as you want), and I'm told that any of their heavier weights are NOT the same excellent formulation (but I'm not positive on this, maybe Patman can chime in with some definitive answers on this??).

02SS#406

iTrader: (1)

Same here. Oil pressure went up, no consumption issues, etc.

BLKWS.6

Up from what? and what M1 were you using?

bww3588

iTrader: (49)

i was using M1 5W30. i had a ticking and my oil pressure idled around 40 PSI and under load around 65-70 ish......now its about 3 PSI more with GC 0W30

uno

I use the M1 0w40 and my oil pressure at idle is about 45-47

o2man98

Yes, the AMSOIL AFL 5w-40 has been and would be a great choice in this situation. 100cst of 13.7. https://www.amsoil.com/StoreFront/afl.aspx?zo=1436102

The 10w-40 is 14.4 @ 100 if you are looking for heavier.
https://www.amsoil.com/StoreFront/amo.aspx?zo=1436102