Mobile-1 0W-30 instead of 0W-40
I just inherited a 1999 E320 4-Matic. I read around and found the oil to use is 0W-40 Mobile1. My local Wal-Mart does not carry 0W-40 but instead has 0W-30 ($22 for 5 qt). Would that be safe to use? What do these numbers mean. I am in the Chicagoland area if that matters (temperature).
Thanks.
napa and other auto stores have the 0w40 the engine needs.
ohlord
Last edited by RichardM98; Mar 13, 2008 at 08:39 PM.
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on the other hand, German Castrol Syntec 0w-30 is thick for a 30wt, so its acceptable for use (i've been using it for the past 1k miles with excellent results).
There are no thin 40 wts and thick 30 weights.
Use mobil 1 ow40 mb spec
use german syntec if you want ,but it is not a thick 30 weight it is just 30 weight and as such like all 30weights is to thin to meet amg engine use,and is most likely to thin for use in area of high temps.
There are no thin 40 wts and thick 30 weights.
Use mobil 1 ow40 mb spec
use german syntec if you want ,but it is not a thick 30 weight it is just 30 weight and as such like all 30weights is to thin to meet amg engine use,and is most likely to thin for use in area of high temps.

considering also that mobil one shears much easier than GC, GC is a great choice for these engines.
Viscosity is ordinarily expressed in terms of the time required for a standard quantity of the fluid at a certain temperature to flow through a standard orifice. The higher the value, the more viscous the fluid. Since viscosity varies inversely with temperature, its value is meaningless unless accompanied by the temperature at which it is determined. With petroleum oils, viscosity is now commonly reported in centistokes (cSt), measured at either 40°C or 100 °C (ASTM Method D445 - Kinematic Viscosity).
for mobil 1 0w40 is such that at 100c it is still thicker as a standard rating than the 0w30 syn you are using.Note the rating and the caveat to amg owners about 0-30 to thin to adequately guard the engine.But make no mistake it is thinner than 0w40.And with the age of these engines going up everyday thick will over rule thin every time
ohlord
Furthermore, it is a general policy of mine that you should run the thinnest oil that you can. More power and better mpg, without any noticeable lack of lubrication. While I would not run a Mobil 1 30wt in any car, I don't think a 30wt is necessarily a problem in this engine, high miles or not.
your mileage may vary, of course.






