BOWTIE

While I do not dispute this conclusion, it is hard to prove since Mobil 1 does not publish their shear numbers like some of the others do (at least not on that link you provided). That said, it is my understanding that the oils with the lower numbers generally begin life from a better base stock than the others.

BLKWS.6

Oil analysis's from BITOG have proved the point that 5-30 shears more than 10-30.

I am really awaiting Patman's take on all this. Guy knows his stuff. My basic question is: My car seems to sound/feel good with 10-30M1, am I increasing wear using it?

RPM WS6

iTrader: (3)

Shears more at/beyond what mileage, roughly?

RPM WS6

iTrader: (3)

Pat is the man!!! He's a great guy that is always willing to help.
I consider him a friend.

Best way to get in touch with him would be a PM.

BLKWS.6

His PM box hates me by now, lol.

JohnnyC

I dont think that there is hate for Mobil 1 overall - I think the hate is for Mobil 1 30 weight. Many of us have figured out that the LS1 responds nicely to a thicker oil, and 40 weight can help with oil consumption and valvetrain noise.

gyrene2003

so all in all, what M1 oil should i use? Using 5w-30 right now and would like to see if i can quiet down the engine compartment alittle. Its not like its loud or anything but u notice it when ur the one drivin it!

Toxic Texan

I work for BP (who owns Castrol) and we use mobil synthetic in all our equipment. You figure it out.

gyrene2003

So are u telling me off or something? Just asking a question man.

RPM WS6

iTrader: (3)

Try the M1 0W40. I went from their 10W30 to the 0W40 and it cut my valvetrain noise in half.

gyrene2003

thnx man

SladeX

Your choice in oils should not be based on the sound the engine makes, but rather the oil analysis at the end of YOUR ENGINE's oil cycle.

That is the only true way to know if your choice in oil is helping or harming your engine.

Second, the LSx series of engines are noisy when compared to today's other modern engines. So unless it's knocking around like a jackhammer or sounding like someone is continuously banging on your block with a hammer, I would think most of your "noisy" complaints are actually typical LSx sounds.

As for doing harm to your engine, yes you can do harm with a thicker oil. Thicker oils = lower viscosity = higher oil pressure = less volume per time. So while you may have "quieted your engine" thanks to a thicker oil, you may find it starving at the higher rpm's for getting oil to the rest of the engine. This is why you don't just drop a 50 wt oil into your engine for the sake of quieting it. Also in comparing engines to say a DOHC 4 banger or something is just plain wrong as the designs make this an apples to oranges comparison.

http://www.blackstone-labs.com/gas_engines.html

INMY01TA

iTrader: (1)

If you read BITOG you should know already they're saying M1 is no longer a full synthetic, just a synthetic blend.

ChocoTaco369

because hardly anyone on this site uses 10W-30 syntec, but we've mentioned OVER AND OVER how much better the german syntec is over the american syntec. so yes, we do.

yes, we do. we say over and over to use synthetics over conventional oil.

first off, american castrol syntec isn't that great. it's been said over and over. it's base oil is not synthetic. it's conventional crude.

now, to answer your mobil 1 question - because people have it beaten into their head that mobil 1 5W-30 and 10W-30 are the best oils for our cars. they complain about piston slap, lifter ticking and oil consumption, yet they have no idea that their mobil 1 water oil is causing the grunt of this. it doesn't matter if your engine is performing well on mobil 1 xW-30. the point is, it could run better. the oil analyses done with mobil 1 xW-30 come back worse than with GC 0W-30, mobil 1 0W-40, mobil 1 5W-40, etc. mobil 1 xW-30 isn't good oil for the LS1. period. it's not the worst oil, but for what else is out there, it isn't the best. i wouldn't run mobil 1 xW-30 in my LS1 if it was free, and i do mean that 100%.

if you really don't know the answer to your questions, send your oil in for analysis. then run a good oil like GC 0W-30 or mobil 1 5W-40. you'll never touch the 30 weight again.

gyrene2003

so 40ws are better, thats what it comes down to right?

RPM WS6

iTrader: (3)

When it comes to M1 oil for use in an LS1 motor, it seems that 40w is in fact better.

Brianss1

just got done doing an oil change 6qts of GC 0w30 and a K&N HP-2006 long oil filter.The filter is not that much longer then stock and the 6 qts put me just a hair over the fill mark on the dipstick.Will see how it does.

BLKWS.6

My car uses no oil (if it does, its like .1qt every 500 miles at most last I checked I couldnt tell any was missing.), and is QUIETER with 10-30 M1 than it was with 10-40 syntec.

dailydriver

This is generally true in any manufacturer's lineup, mineral or synthetic. This is one reason some don't like/are fearful of 5W-40s, even though I have NO FEAR in using this weight from Redline, Amsoil, Castrol (BC), Motul or Fuchs (Silkolene). But, if at all possible there is less chance of shearing with a closer "spread" in the viscosity rating.
BTW; most of the "hate" for Mobil 1 is directed towards the NON EP line. Even Patman usually says the EP line is OK.

Mr Incredible

There's nothing wrong with Mobil1 Xw-30 that moving up to Xw-40 won't fix.

GC may produce the best performance numbers in an oil analysis, but if you can't find it what difference does it make? Sure, some of you are lucky enough to have it in your area, or have the $$$ to buy it at online prices...but many of us don't have either.

And for us, the easiest way to get the best performance at a reasonable cost is to use a 40weight Mobil1. I feel no shame for doing it.

I just can't imagine how anyone can still be using regular petroleum oils even in their lawn mowers.