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SN is an API rating. The benefits include:
  • Improved fuel economy
  • Improved life of emissions system components
  • More stringent sludge, deposit, and oxidation control
  • Better low-temperature viscosity
  • High- and low-temperature corrosion protection
  • Better turbocharger protection
  • Improved filter clogging protection
 
It is ironic that those who lose an engine are doing so when running unloaded. I don't think I've ever heard anyone say they lost an engine while towing.
My 15 dropped on me when I was on vacation. 70k kms using tow/haul and pulling my 7k loaded TT.
 
My 15 dropped on me when I was on vacation. 70k kms using tow/haul and pulling my 7k loaded TT.
That wasn't a very happy vacation, huh? Thanks for sharing. I think @Doog-Meister was also towing when he lost his engine, although, I don't think his was a bottom end failure.
 
Luckily we were just over an hour from our camping spot and we do a family vacation. My oldest son carried on to the camp ground with his 19 Hemi, dropped of his pop up camper and family and came back for us. While he was gone my wife and I unloaded the truck on the side of the road and called for a tow for the truck to the nearest dealer in Kingston. While waiting for the tow I took my tune off so as not to loose it. My son didn't like pulling my trailer as he got around 9 mpg. My Eco was running at around 16. I had my younger son bring my Jeep Grand Cherokee to the camp site on the Friday before leaving the campground on the Saturday for home. I pulled my older son's pop up home and he pulled my TT. His truck didn't have a brake controller, so it was a careful drive home and a few more fuel stops for him.
 
My 15 dropped on me when I was on vacation. 70k kms using tow/haul and pulling my 7k loaded TT.
Yet another low-mileage older truck engine failure. I notice a LOT of these. I don't want to speculate why but seems to happen more often than the older high-mileage trucks.
 
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Yet another low-mileage older truck engine failure. I notice a LOT of these. I don't want to speculate why but seems to happen more often than the older high-mileage trucks.
Everyone with knowledge seems to agree that low mileage failures point towards assembly issues. There's nothing you can do to prevent those failures.
 
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