I spent a lot of money to ensure my engine was built right and used the best parts I could buy. But, now I hear the oils presently made aren't as good as days gone by. I know that oils from the '70s, '80s and '90s were probably best ever made, but now I hear this is no longer true.
I've never used any oil additives. In the past, I've had several cars that have given over 100,000 miles of faithful service, with 3,000 mile oil and filter changes. Three engines, a Mercedes 240D diesel, a '72 250 Chevy 6 on propane and a VW Rabbit, ran over 200,000 trouble-free miles with the same oil/filter program. (I traded the 240D in at 310,000 miles) I've always used one of three oils, Chevron and Chevron diesel, Valvolene, or Pennsoil.
Now, I'm told that most the oils have been reformulated, because some additives that prevented wear, but create pollution, have been removed.
Not having any experience with additives, I don't know the difference between the hype and truth of claims.
I'd welcome anyone's experience and solid proof about this subject.
