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Mobil 1 5W-20 and Chrysler MS-6395
Why is your Mobil 1 5W-20 not Chrysler MS-6395 spec approved? Or if it is, why is the certification not on the bottle or website?
Chrysler’s latest revision to the MS-6395 specification calls for a field trial spanning multiple seasons over two years. While we fully expect the exceptional performance of Mobil 1 synthetic motor o...
Why Switch Motor Oil Viscosity in Different Seasons
My '99 Grand Prix has the 3800 engine which calls for two different viscosity engine oils. 5W-30 when temperatures are below 32° and 10W-30 when temperatures are constantly above 32°. My question to y...
The key difference in these two viscosity grades of Mobil 1 does not necessarily lie in the Pour Point measurement, but with the results of an industry low-temperature viscosity test called the Mini-R...
Concern that Contaminants Linger Longer with Extended Oil Drain Intervals
I realize these oils are durable and do a good job keeping the engine from sludge. But is it a good idea to keep the contaminants floating around for so many miles?
ExxonMobil does extensive field testing in extremely challenging environments. In the course of this testing we do extensive oil analysis and, at intermediate and at the end of the test, a full engine...
Oil Film Strength of Mobil 1 Compared with Royal Purple
Does Mobil 1 have less oil film strength than Royal Purple? I have seen many times the friction test of oils using the machine that test the oil film, test result shows that Royal Purple has more fric...
There are certain oils in the market today that use EP (extreme pressure) additives in their engine oil that are really designed for gear oils and not engine oils. Extreme pressure additives are typic...
Rebut Amsoil's Wear Scar Testing
Being a customer of Mobil 1 since the mid-1970s, I have noticed a number of websites that assert Amsoil is better, such as the following: "20W-50 Mobil 1 Supersyn leaves a wear scar over 5 times that ...
See the answer on oil film strength. Look beyond bench tests and look to the real world where Mobil 1 is recommended by OEMs (original equipment manufacturers) worldwide as original equipment in their...
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