ChocoTaco369

mobil 1 5W-40 or 0W-40. i'd try them both and pick the one that felt like it had the most throttle response, most mpg and least valvetrain noise.

IMHO 15W-50 is far too thick. it's going to protect you very poorly during startup, cut your fuel economy and take away significant horsepower.

Eatinstang4life

iTrader: (10)

you guys can hate all you want, You guys can use what ever oil you want. All I know is that I have been using regular old 10w-30 bulk oil in my 01 ws6 for 2 years now, no buring no consumption and no tick. It just sickens me to think that people think they are going to be faster with different oils.

o2man98

IMO you should also add AMSOIL European 5w-40 to the list above. It has shown some good results in the LS1's. All the oils listed will be good however.

ocshaman

There was a thread on BITOG talking about Mobil1 pricing itself out of the market. There was talk of PP, and the numbers seem to be doing well with it. Give it a try, and see how it works.

RevGTO

iTrader: (12)

There was a thread on BITOG a year or two a go in which a GM engineer explained why synthetics were unnecessary for 99% of drivers. He pissed a lot of people off but it was hard to argue with his expertise. That being said, I use GC because here in Kansas, it can get down to 0* in the winter, and 100* days are common in summer. GC has great cold flow characteristics and maintains excellent oil pressure when it's really hot.

99camarols1m6

If I could get that oil for what I'm paying for the rest of them i would deffinately do itbut we don't stock it here. I have heard that great things about it. Some people say that it's as good or better than GC 0W-30 but who knows... I just got 6 quarts of mobil 0W-40 and a mobil filter for free so we will see how well works...

TORCHD 02 TA

iTrader: (39)

i might have to try the M1 0W40.. but isnt that thiner than M1 5W30??

ChocoTaco369

faster? what are you talking about? if anything, you may lose a few hp going to GC 0W-30 from mobil 1 5W-30. reason being, GC is thicker resulting in more parasitic loss. it will likely only be a few hp. no one uses GC 0W-30 to go faster. they use it to protect their engine better. perform some oil analyses on your engine. if you like the results, stick with it. if you don't like the results, go with something else.

Asmodeus

1) You're an idiot.

2) You work in the oil industry, likely sweeping floors at a plant, because your education sucks. This is shown by your obvious lack of spelling knowledge.

3) You don't even know what kind of headers are on your car.

4) http://www.bobistheoilguy.com

5) How many oil analysis' have you sent your oil in for?

6) Who said anything about being faster? I want the best oil for protection.. you know, the oil that shows the least damage on a standard bearing crush test.

7) It sickens me to think that some people can still say "oil is oil".

ChocoTaco369

no. 0W-40 is great because it's thinner at startup so it gets to parts quickly. startup is the most dangerous part of an engine's life because during startup, there is no fresh oil being pumped through the engine since oil doesn't start pumping until the key is turned, so for that split second, it's the driest environment for an engine. the very thin 0W-40 gets to all the parts much quicker than 5W-30, giving superior startup protection. once the engine warms up, however, the 0W-40 is thicker than the 5W-30, better lubricating parts.

the GC 0W-30 tends to be noisey and startup. my piston slap is pretty noticable during startup idling since the oil at that point is water thin. however, as soon as my engine warms up, it mostly goes away. my engine's valvetrain noise never completely goes away, but since it's common with LS1's i'm not too worried. it's still relatively quiet. you can only really hear it if you're focusing on it.

TORCHD 02 TA

iTrader: (39)

yup i know what you are talkign about.. on startup you can hear the piston slap.. but once it warms up, unless you listen for it, it is not there. so you do recommend 0w40.. What else. i am also running the K&N Oil Filter

ChocoTaco369

well, i recommend mobil 1 0W-40 only if you refuse to put the effort in to get GC 0W-30. mobil 1 0W-40 still falls short of GC. the reason why i recommend mobil 1 0W-40 if you refuse to jump on the GC bandwagon is it's similar in viscosity so it'll give similar noise supression characteristics. also, mobil 1 is fully synthetic unlike most marketed synthetic oils. so IMO it's really the only other option. that being said, its base oil is nowhere near as advanced as GC 0W-30's. the only way i'll ever get mobil 1 0W-40 is if they stop importing GC 0W-30 to america and it gets impossible to find.

the K&N filter is supposed to be a good one. right now, i'm running the napa gold (wix) filter. no complaints. reason why i run the napa gold is apparently it has even better filtering capabilities (with the expense of a little flow) and is $3 cheaper which is always nice.

gillbot

iTrader: (27)

My oil analyst friend disagrees and thinks it's a shade heavier than I need but will do just fine. It's probably closer to what my car should be using than the 5-30 and so far the analysis supports this.