So i just bought this 1986 ford taurus from my grandmother only has 66k miles on it! Was garage kept lol. Looked at her oil sticker looks like she changed it 4k miles ago but 1.5 years ago haha. Changed the oil looked way dark and thin but can't really tell much from just draining it. Anyways went and bought Penzoil HM and a ST filter am going to do 5k oil changes or 6months never heard anything about this oil is it good? Any oci's with it?