Pennzoil Platinum® Full Synthetic Motor Oil helps extend engine life and protects for up to 15 years or 500,000 miles, whichever comes first. Guaranteed.4 Pennzoil Platinum® is made from natural gas, not crude. Its base oil is 99.5% free from engine clogging impurities and is designed for complete protection for top engine performance. The Proof is in the Pennzoil. ​