Mobil 1 15/50 - is it still available?
 

The 15/50 sythetic, I've been using it for years, had no trouble finding it a year ago, but now none of the stores seem to have it anymore. A bunch of other weights like 5/30, but no 15/50. Seems they don't stock it anymore.

I looked on Mobil's website, and it seems like it should be still available.

I buy it every day from the local advance auto parts store. Also, if there a cosco near you , they usually have it at a better price.

WALMART is where i bought big bottles the last time.

i switched to BP in 20/50

I buy it all the time. The catch is whether you can find the stuff with the older API rating. I think it used to be the red cap stuff, they then switched to "Extended Performance" with the yellow cap, but made the old SL-rated stuff with a silver cap on it. Very confusing stuff and a ton written about how it affects air-cooled engines and cats.

We bought our last case was at Costco....not sure if they're still selling it.

Yep, it's still available. Royal Purple 15-50 is still around too.

I use M1 15-50 in my 928. It's still around.

walmart $22 for five quart size

Mobil has not upgraded their formula to the latest API specs - they are roughly 8 years behind. Look at the API seal on the back. The key is to look for CJ-4 - even though the C designation was originally intended for commercial engines like diesels and the S designation was for passenger, the two have been virtually identical over the past 15 years or so - the add packs that chemical companies sell to blenders is a combined S/C formula. This way the blender doesn't have to make two different oils but they can market and label differently.

The key is to look for a CJ-4 designation on the API seal. This will provide the latest greatest formula.

From API:

As for the Mobil 15W50:

Specifications and Approvals

Mobil 1 15W-50 meets or exceeds the following industry specifications: API SM,SL,SJ,EC,CF


Typical Properties


Viscosity, ASTM D 445
cSt @ 40º C 131.2
cSt @ 100º C 18.1
Viscosity Index, ASTM D 2270 154
Sulfated Ash, wt%, ASTM D 874 1.21
HTHS Viscosity, mPa•s @ 150ºC ASTM D 4683 4.50
Pour Point, ºC, ASTM D 97 -39
Flash Point, ºC, ASTM D 92 235
Density @15º C kg/l, ASTM D 4052 0.87

For an older car, you will be fine using this oil but for newer cars - 2008 and newer, the ash is too high. Look for a CJ-4 designation.

http://forums.pelicanparts.com/uploa...1244561591.jpg

Here is what the seal looks like

$22.00 at my local Walmart. :)

hmm. It's a conspiracy man! :D

anyways, i use real dino. non of this synthetic stuff. ;)