WS6 Rampage

iTrader: (3)

Hey, does anyone have or know of a good engine oil weight wright-up? ... Tried a search but found nothing that I was satisfied with.

LS1WS6dreamer

iTrader: (1)

I hear people talking about bobistheoilguy.com, that or google it.
There is also a lot of info on this site about oil, prolly just type in "best oil" or something to that nature. I did that once and read enough about oils and what people use to last me a lifetime.

Sorry I couldn't help more.

hitmanws6

iTrader: (20)

What are your questions? The 3 best off the shelf combos IMO (Excluding AMSOil, you have to order that) are German Casrtol 0w-30, Mobil 1 0W-40 and Mobil 1 5W-30 and 15W-50 mixed (5qts of 5W30, 1 qt of 15W50)

LS1WS6dreamer

iTrader: (1)

i just use 10w-30. However, if or when I get a new engine, I will use synthetic.

lubelizard

iTrader: (5)

Search the bobistheoilguy forums. A lot of information.

WS6 Rampage

iTrader: (3)

I used GC 0w-30 on my first motor in this car. I didn't really notice any difference other than what sounded like more valve train noise. I'm currently on a 10w-40 right now. Thinking about trying out RP 10w-30.

hitmanws6

iTrader: (20)

Ill never use RP again, im convinced it caused my last motor to fail. Try M1 0W-40

WS6 Rampage

iTrader: (3)

Really?!... Hmmm

Wouldn't you use a viscosity grade like 0w-40 if you had a combination of high miles and very cold weather. I could be wrong.

LS1121

iTrader: (17)

I like the M1 5W-30 my engine has over 253,000 miles. Always used Mobil1.

O2Form

I've found over 100's of thous of miles you can't beat plain old regular motor oil changed every 5k. I like 10-30.

bayer-z28

iTrader: (14)

same here but 59k miles. Been using M1 almost since I bought the car. (Started late, but always ran synthetic)

PheonixLS1

iTrader: (4)

Don't you realize that your manual AND Pontiac will tell you that 10w40 will cause bearing failure in your motor. The composition of the oil molecules are to thick to get in and properly lubricate your bearings. Go to 10w30 quick!!!

TXZ28LS1

iTrader: (5)

My old 2000 Z28 and ran regular castrol GTX 10w-30. Never had a problem with it.

My current car is a 2002 Z28 and i ran castrol syntec 5W-40. i just switched to castrol syntec 5w-30 and never had any problems. Always had good oil pressure, and never really any ticking issues, or oil consumption.

Grimes

iTrader: (3)

M1 0w-40 works great in these cars. I would give that a try.

Head Hunter

iTrader: (14)

If one was going to switch brands and weights (10w40 to 0w30 for example) would one need to flush the entire system or would just a normal drain and fill with new filter be enough?

BODUKE

I use ams oil 5w30 with no problems. 85,000 miles running strong.

WS6 Rampage

iTrader: (3)

OMG OMG OMG!! ....

trans_am7935

iTrader: (15)

i have used castrol syntec 5w-30 since i owned the car. i love it, quiet, no burn off and still looks pretty good when i change it.

hitmanws6

iTrader: (20)

And yes to your reply to my post. But overall LS and LT cars both like a thick 30 weight/thin 40 weight. M1 is a thin 30 weight, RP is even thinner. The 0W-40 is a thin 40 weight and Castrol 0W-30 is a thick 30 weight. Both produce similar wear numbers and arguably the best wear numbers. I recommend both, the M1 more so because for some reason its harder to come by GC and M1 is over $1 cheaper at Wal Mart.

WS6 Rampage

iTrader: (3)

Cool. I'll look into it then. ... I stopped looking for GC awhile ago after my first motor popped. I also noticed AutoZone stopped carrying it and so did a few other places. ..