We started the ROWE Stress Test to prove that the modern Made-In-Germany ROWE product lineup is an excellent choice for your European car. Now that the results are trickling in, we get the opportunity to back that claim up with real numbers. We sent ROWE oil changes (complete with MANN filter) to all types of different engines and driving styles to get the biggest variety in the test. This week we’re taking a look at William T’s 2008 Mercedes E550, which comes equipped with a 5.5l V8 called the M273.
The M273 V8 is based on the M272 V6, just with a pair of extra cylinders on the end. It’s the successor to the popular M113 which itself was an M112 with a pair of cylinders stuck on the end. The M273 features all aluminum construction (block and heads), forged connecting rods, sequential computerized fuel injection, double overhead cams with continuously variable timing, 4 valves per cylinder, and the notorious magnesium variable runner length intake manifold. There are two versions, the E47 and the E55 which, as you guessed, supply 4.7l and 5.5l of displacement respectively. William has the larger E55 in his very shiney E550, and when it was new it was good for nearly 400hp. Not bad.
He purchased the car in 2012 and immediately had the oil tested. It showed slightly elevated sodium and potassium levels which was suspected to be a bit of coolant leaking into the oil. Since then, those levels have decreased and his engine is very healthy with 85,000 miles on it. This is a commuter car, so mixed highway and city style conditions are what it sees the most. Now, let’s take a look at how the ROWE SYNT RS 5w40 did in this beast of a motor over a 5,000 mile interval.
One interesting thing to note is that the Mobil 1 used prior showed increased Moly levels in it. Molybdenum is a popular friction modifier which is widely used in engine oils to add protection on wear components, but it also has some downsides. Just head over to Bob Is The Oil Guy and do some searching about the use of Molybdenum (specifically Molybdenum DiSulfide) in engine oil to see the mixed reactions both ways. Either way, the ROWE is able to do a great job without it, so there you go.
Thanks for letting us use your engine as a demonstration William, we’re glad you like the oil and wish you many thousands of good hard miles with your Mercedes!