i_luv_s2k

Thanks for the link, very useful.

XxMerlinxX

According to the guys over on BITOG.com, Mobile1 0w30 is actually thicker at regular temperatures than their 10w30.


_____________cST@40C __ cST@100C
Mobil 1 10W30---- 62.0----------- 10.0
Mobil 1 0W-30----- 63.1 ---------- 11.0

The 0w30 doesn't actually begin to get thinner until you hit around -10 degree F. The 0w test is actually conducted at -30*f, so if you live in Northern Canada or some other super cold region, I'd say the 0w would be a better choice, but otherwise I'd find something else.

zeroptzero

Where are located ?. If you need more cold weather protection Castrol Edge Titanium can be obtained in a 5w-30, otherwise the 10w-30 is a good choice. I hope to have a used oil sample of mine shortly.

i_luv_s2k

Oh ok. That clears up things a bit. So when they talk about "cold starts", it's the times where you start the engine in -10 to -30 degree F environment, not the first cold start of the day regardless of location (what I thought lol).

Good info.

i_luv_s2k

I'm located in Southern California. Yes, 10w-30 it is then. Nice, please post your results when they arrive. Peace.

XxMerlinxX

No, you had it right the first time. When people talk about "cold starts", typically they're talking about starting the engine for the first time before the oil has warmed up at all. The confusion comes from the 0w30 designation. People believe that because "0" is the cold number of this oil, that the viscosity rating must be lower than that of a 5 or 10 weight oil. I don't know if this is true for all 0w oils across the board or just Mobile1 though.

Gatsbee13

the Amsoil preferred customer option is tempting.. 25% off oil for 6months to 1 year (depending on which term you pick).. thinking about just buying the 6 month term for $10 and buying 4 cases of the 1 gallon jugs.. itll probably be ~$120 for all before shipping and tax.. I called Amsoil and they told me that shipping is by weight (not distance).. and the more you buy (or heavier the package), the cheaper it is.. I got quoted ~$14 for 4 (1) gallon cases as opposed to ~$10 for 1 gallon.

also, if I decide to buy Amsoil, should I just opt for the 0w30? 10w30 is about $2 cheaper per gallon..



EDIT: just found a link to a free Preferred Customer account for Amsoil by googling "Amsoil"..

MBHs2k

I ran Amsoil 0w-30 for 20,000 miles before supercharging my S. I spoke to someone at Amsoil and they said using it instead of 10w-30 would be fine and that you may see some better fuel economy as well

Gatsbee13

just spoke to an Amsoil distributor in my area.. I asked him about the 0w30 vs 10w30.. he told me honestly to go with XL 10w30 series since im changing my oil every 6k miles.. the XL is $10 cheaper per gallon than the Signature series (signature is warrantied at 25k miles and XL is 10k miles).. hmm, ill have to look into this..$29 per gallon for XL - 25% for preffered customers sounds good.

cosmomiller

[/quote]

No, you had it right the first time. When people talk about "cold starts", typically they're talking about starting the engine for the first time before the oil has warmed up at all. The confusion comes from the 0w30 designation. People believe that because "0" is the cold number of this oil, that the viscosity rating must be lower than that of a 5 or 10 weight oil. I don't know if this is true for all 0w oils across the board or just Mobile1 though.
[/quote]


Motor Oil 104

Part Four. It is not what we thought.

Now let us finish talking about the differences of mineral verses synthetic oils. I will compare the same weigh or grade of oils showing that the operating viscosities are the same whereas the startup viscosities vary:

Mineral oil:

Oil type...Thickness at 75 F... at 212 F...at 302 F

Straight 30..........250....................10..........3
10W-30...............100....................10........ ..3
0W-30..........There are none in this range......


Synthetic oil:

Oil type...Thickness at 75 F... at 212 F...at 302 F

Straight 30...........100...................10...........3
10W-30.................75...................10........ ...3
0W-30...................40...................10...... .....3
Motor Oil 109

Chapter nine. Let’s start over.

We have seen that 0W-30, 5W-30, 10W-30 and straight 30 weight oils all have the exact same viscosity at 212 and 302 F. What about startup viscosities? Do 0W-20, 0W-30 , and 0W-40 all have the same viscosity at a 75 F startup. The answer is no. The SAE J300 standard allows for this discrepancy. Here are some examples:

..Viscosity at 75 F startup..

...0W-20.....0W-30.....0W-40
.....40............50...........60

The numbers are not exact but they show clearly that the ”0” represents different startup viscosities. This is unlike the 0W-30, 5W-30, 10W-30 and straight 30 weight oils that all have the exact same viscosity in a hot engine = 10 cS.

I would like to comment on the following statements made by a knowledgeable automotive enthusiast:
“Pressure and flow are tied together with viscosity, but none have anything to do with lubrication. Lubrication is a property of the fluid, not the force. The oil pump would pump water just as well, but it would offer no real lubrication. If we double the pressure, we double the flow. If you decrease the viscosity to a lighter oil, you increase flow at a loss of pressure. High flow helps to carry away more heat. High pressure helps to keep metal parts like the bearings out of contact with each other (scuffing).”