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We have a 94-940T, as well as a 92-940 N/A, and a 97' 960. Try Mobil 1 0W40. This is factory fill in many new Mercedes-Benz engines, as well as some others.
In the 94 turbo at the beginning of this winter while running Amsoil 0W30 there was a distinct noise when the engine was cold. Amsoil does not use molybdenum as an additive.
After a change to Mobil 1 0W40, no noise - period. So far I am impressed with this oil. Gas mileage seems unaffected, but then again it's winter. Oil analysis later will show if it is performing well IN THIS ENGINE, I think it is but only analysis will show me the numbers.
I personally believe it is due to the molybdenum additive in Mobil 1. One of moly's functions is to act as an extreme pressure barrier, preventing metal to metal contact. The moly is "taken up" by surfaces that are in metal to metal contact. Once it plates up it helps to prevent metal to metal contact.
I might add that the Mobil 1 30 weight oils, are at the bottom limit in viscosity for a 30 weight.
30 weight viscosity oils range from 9.30-12.49 cST 100C
Mobil 1 30 weights are 9.8 approx.
Castrol GTX 10-30 is 10.9 approx.
40 weight viscosity oils range from 12.50-16.29 cST 100C
Mobil 1 0W40 is is 14.6
Molybdenum seems to make a difference. Redline oils contain over 500 ppm of moly. I have some on hand that will be the next fill for my 92' 940. This one has a pronounced piston slap when cold.
I have used Mobil 1 10-30 in my vehicles in the past and oil analysis revealed that engine wear was just average in most respects, and I mean just average when stacked up against all other brands of regular old petroleum oil. My goal is engine longevity and wear numbers lower than average.
I have a 92'940 (before longer piston skirts) and it has a pronounced piston slap, but only when cold. Based on a 90% piston slap reduction reported on another forum when using Redline oil, I purchased some. It hasn't been put in yet. Redline oils contain over 500 ppm of moly.
From oil analysis results in my both of the 940's, 30 weights just don't seem to cut it when it comes to wear numbers on the internals. Okay, numbers, but I want below average wear. Every oil that I have ever used seemed to be good. Just change it out every 3 thousand miles. Oil analysis produces the real evidence - how it performs in that particular engine. I was surprised at the results.
That is why I am moving up to a 0/5W40 weight synthetic oils. Real good winter starting, real good high temperature, high shear protection especially in the turbo.
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92-944, 94-944, 97-960 - Silverstar headlights, Green Diamond Tires
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