I got 520,000 miles out of a 6.2 diesel in an 87 3/4 ton Suburban. That's pretty unusual and impressive. It always had Shell Rotella T, 15W-40. That certainly doesn't prove this oil is the best, but certainly proves it's pretty good.
I have several Ford pickups with diesel engines (6.9 and 7.3 turbo IDI) and well over 200K miles. My Dodge with the 5.9 also now just hit 200K. My 83 Chevy Blazer with the 6.2 diesel has 275K miles and had been a winter plow truck for many years. My wife's 91 Volkwagen diesel just turned 300K miles. My 1981 Chevy Chevette diesel has 250K miles.
Note that all have been using Shell Rotella T, 15W-40. I'll add that this oil was reformulated in 2009 and the ZDDP additives were lowered, but just slightly.
I've also heard good reports with Delo. Just don't happen to use it since I rarely see it locally at good prices.
When it comes to diesels, I've only seen one HD oil that was known to be bad. That was Quaker State HDX. Used to be very popular until a bad batch destroyed many engines in the early 80s.
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