I came across this description of an engine warranty from Pennzoil for 15 years or 800,000 km. (Roughly 500,000 miles)
It’s not so much the warranty, but have you owned a vehicle for 15 years without any internal engine problems?
My 2008 Chev Suburban 3/4 ton with a 6.0 LS engine is now 15 years old and has not ( knock wood) had any engine problems except for worn out engine accessories not dependent on oil lubrication. It has just short of 250,000 miles. I used mostly Pennzoil Platinum 5w30 and for the last few years have been using PP Euro 5w40 and PP Euro LX 0w30 in the winter. It’s only a coincidence that I used mostly Pennzoil products. ( or not). I was attracted to the Pennzoil rebates mostly, but it looks like Pennzoil has served me well. Perhaps others can chime in with their 15 year experience.
View attachment 144809