Mobil 1 15W-50 for Turbos - What do you use?

[touringpro]

Originally posted by Cal Cruzer

Viscosity is viscosity no matter what you are measuring, Mobil 1 or pancake syrup. That is why they have the viscosity ratings. It is to measure the flow potential of fluids (I think an engineer could explain this better than I). If Mobil 1 is telling you that the ratings do not apply to them then they have a problem with their oil (not likely) and should not be publishing ratings in viscosity for their products. We have to be able to rely on this information.

Viscosity is a range not an absolute number - and it can vary significantly from brand to brand within the same weight range. From SAE J300 revised June 2001, Engine Oil Classifications (Kinematic Viscosity (cSt) at 100°C):

20: 5.6 min. - 9.2 max.
30: 9.3 min. - 12.4 max.
40: 12.5 min. - 16.2 max.
50: 16.3 min. - 21.8 max.
60: 21.9 min. - 26.0 max.

Mobil1's numbers are as follows:
0W-40: 14.4
0W-30: 10.1
0W-20: 9.0
5W-30: 9.7
10W-30: 9.8
15W-50: 17.4

[PTGT Redman]

What does DC rec for the turbo?
What, other than synthetic, seems to be the best viscosity for year round driving?

[Sci-Fi]

Originally posted by PTGT Redman
What does DC rec for the turbo?
What, other than synthetic, seems to be the best viscosity for year round driving?

Look in your manual, think I only seen 5w-30 and 10w-30 listed, when I was looking at my neighbor's new Turbo PT.

From the 2003 service manual:

SAE VISCOSITY
An SAE viscosity grade is used to specify the viscosity
of engine oil. Use only engine oils with multiple
viscosities such as 5W-30 or 10W-30. These are
specified with a dual SAE viscosity grade which indicates
the cold-to-hot temperature viscosity range.
Select an engine oil that is best suited to your particular
temperature range and variation (Fig. 2).
² SAE 5W-30 engine oil is preferred. SAE 5W-30
engine oils improve low temperature starting and
helps vehicle fuel economy.

ENERGY CONSERVING OIL
An Energy Conserving type oil is recommended for
gasoline engines. The designation of ENERGY CONSERVING
is located on the label of an engine oil container.

SYNTHETIC ENGINE OILS
There are a number of engine oils being promoted
as either synthetic or semi-synthetic. If you chose to
use such a product, use only those oils that meet the
American Petroleum Institute (API) and SAE viscosity
standard. Follow the service schedule that
describes your driving type.

MATERIALS ADDED TO ENGINE OIL
The manufacturer does not recommend the addition
of any additive to the specified engine oil.

[Cal Cruzer]

Viscosity is a range not an absolute number - and it can vary significantly from brand to brand within the same weight range. From SAE J300 revised June 2001, Engine Oil Classifications (Kinematic Viscosity (cSt) at 100°C):

Range or absolute,still, viscosity is viscosity. A 50 weight is more viscous than a 30 no matter who makes it and it takes more hp to pump a more viscous fluid. Even by thier numbers.

[zzzhuh]

In my GT I use:



Summer 10W-30 Mobil 1

Winter 5W-30 Mobil 1

[PTGT Redman]

That maeks sense.
I was using 5w30 year round, but would it be reasonable to use a synthetic 10w30 for hot weather driving?
I live in a temperate area, so would it really make a difference?

[imdpapaa]

In my 77 dodge power wagon i use 10/40 havoline and have for 25 years and the only thing i have done to it is timing chain and valve job... in my pt i use 10/30 mobil one because the las vegas temp can get to 120 and 5/30 is way to thin..