Pennzoil Platinum High Mileage Motor Oil provides better protection from friction than any other leading motor oil. It's simply the best. It carries a 10 year/300,000 mile warranty to back up what they say. Sure it cost more but when you look at the increased oil change intervals and reduced maintenance it is a better bargain than conventional motor oil. High mileage synthetic oil should be used in vehicles with 75,000 miles or more. 7 out of 10 new vehicles require synthetic oil. Manufacturers know it's better for their own warranty.
For those that don't know synthetic motor oil is modern technology that converts natural gas into 99.5% pure base oil. Then high tech additives are added for superior protection. Conventional motor oil is made from crude oil and just doesn't compare to synthetic.
Pennzoil Platinum leaves your pistons 40% cleaner. It conditions seals to prevent dry rot and cracking which reduces oil burn. There is no reduction in horse power. There is faster low temperature oil flow and better protection in extreme heat.
I have one old car I used conventional oil up to 80,000 miles. It averaged 24 mpg on the road trip before last. Then this last trip I changed the oil right before I left. I switched to Pennzoil Platinum. I averaged 28 mpg. That sold me right there. It's definitely a better bargain.