According to my simple math, my 1985 300D has over 173,000,000 (that's million) power strokes under it's belt!

Here's my simple math:

Let's say the vehicle averaged 70 mph (a stretch I realize for us city driving types, but play along). At 70 mph, it would take 1928 hours to go the distance on my Benz (135,000 miles)

If my engine is spinning at 3000 rpm, (which is pretty close for 70 mph), it would be turning at 180,000 revolutions/hour.

In 1928 hours of driving, the engine would have made 347,000,000 (that's million for us simple types)

Finally, a four cycle diesel engine has one "power stroke" for every two revolutions of the crankshaft. Consequently, my engine has experienced 173,500,000 "power strokes" in it's 21 year life.

The "true" number of power strokes on my vehicle is greater than 173.5 million since it has not likely averaged 70 mph!

Why am I impressed? I just changed the oil on my 85 and could not detect any noticable cosumption after 4000 miles. I salute the Benz engine designers!

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1985 300D Turbo California Model (134K)