wildcamaro

iTrader: (15)

i use 0w-20 all the time when changing my mos toyota camry oil...its a 0weight when cold then oncve warm works the exact same as 5w-20...5w and 0w weight oils are good for startup when cold, helps the starter motor turn the motor over easier....but 0w-30, 5w-30, 10w-30, and straight 30 wieght are are the EXACT same oil once the enignes warms up, only difference is their viscosities at start up when cold...i wouldnt run anything but mobil 1 5w-30 synthetic in my LS motors

bww3588

iTrader: (49)

Ok, now we are getting somewhere. Now who is the one lacking education?

bww3588

iTrader: (49)

I finally agree with you wild, except about the 530 Mobil 1. 540 is a better choice because Mobil 1 530 runs on the thin side of life.

mannyman84

iTrader: (2)

5w30 is recommended so that's what I'm sticking with. Better fuel economy too.

mannyman84

iTrader: (2)

I hate it when these dumb parts guys at the parts stores tell me to use 10 40 or thicker because I have over 100k.(no offense to anyone here) Pretty uneducated people there.

01ssreda4

iTrader: (96)

They are likely suggesting that to compensate for 100k worth of bearing wear. Bearing tolerances do open up as mileage accumulates.

wildcamaro

iTrader: (15)

thats true about parts people, some can be down right retarded...when engineers design an engine they decide the oil viscosity at the same time they are determining hydrodynamic thickness (think oil clearances) and bearing shape...so in my eyes unless you have an issue like burning oil i wouldnt run anything except the recommended, but if their has ever been a more debatable topic than what oil weight to run then i havent heard it, ive heard everything from guys running valvoline vr50 weight in honda civics to guys with ls1s using 0w-20 in order to eek out the last bit of power possible (which is usually for a dyno number, bc that isnt good for bearing life!!)...

bottom line when i learned about designing bearings and how to determine viscosity the main parameters where found on a chart (as are many engineering properties!!), now granted many of the viscosity curves cross, but usually engineers choose the most "usable" oil viscosity when it comes to all aspects (bearing life, horsepower, fuel economy, start-up,fatigue, longevity)...that is why I choose 5w-30...but i dont knock anyone else for their choice because cars are about individuality when you think about it, so while sometimes i might disagree, i dont hate on someone for their mindset...

let the debate begin...again lol

wildcamaro

iTrader: (15)

also that oil weight is going to directly corelate to oil pressure specs as well! lots of different aspects when choosing a simple engine oil viscosity huh?

bww3588

iTrader: (49)

In most cases, yes it will relate to oil pressure, however if you have an engine blueprinted for tighter clearances, you will need to run a thinner oil to compensate to get desired oil pressure. If you try to run 10 weight oil in an engine with loose tolerances, either by build or wear, your going to have low oil pressure. By the same token, if you run 30 40 weight oil in an engine that's built tighter than a nun's ****, you could possibly have too high of oil pressure and increased drag on moving parts.

mannyman84

iTrader: (2)

Like these new hybrids now days. Toyota recommends the 0w20 for best fuel economy to achieve the 50 mpg. If u start using thicker oils later when the the car has more miles as suggested by parts guys u will be getting 30 mpg just like a regular 4cylinder engine.

mannyman84

iTrader: (2)

I remember when I first got my third gen I didn't know about this oil viscosity stuff, I had a mechanic tell me to use 20w50 (over 200k on it) I would use 20w50 and my MPG sucked ***. I would literally use about 1/4 tank one trip to work. This is driving about 12 miles. Started doing research and found that this oil was pretty thick. Started 5w30 and wow needle barely moved. I was atleast 23 mpg... I was really surprised.

wildcamaro

iTrader: (15)

Yea ur right BMW about different oil weight if you have non stock oil clearances...however when you would have to run some heavy oil to compensate for wear you should be rebuilding lol

mannyman84

iTrader: (2)

BMW's are stupid with their engines.

butler

At 55 I lack in a lot of education because I don't know everything. But I do know there is such a thing as 0 weight oil. I would not use it in anything but a sewing machine. I prefer a synthetic blend myself. 10w-30.

mannyman84

iTrader: (2)

Why 10W?