Quote:
Originally Posted by mbzman
I'm sorry but that is just bad advice. There is absolutely nothing wrong with running synthetic oil. With that being said, Rotella or Chevron Delo 15W-40 are both excellent oils for their higher ZDDP content. Changing your oil on time and using a quality oil filter are more important than choosing one brand or grade of oil over another.
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1)- being a 1991 the car wasn't designed with synthetic in mind. Oil has changed and not for the better:
See report by Charles Navarro of LN Engineering:
Oils: What motor oil should I use? Which oil is best for my Porsche or aircooled engine?
2)- Synthetic oil has low ZDDP.
3)- it is proven to cause leaks, or hasten the onset of leaks.
4)- why screw with something that works fine?
5-
it's a big waste of money, doubles the cost of the oil change and high risk for what? No benefit in this case (unless you count leakage)- a 116K motor that's 20 years old that at best, has questionable seals? That's all you will get.
Don't believe the synthetic hype. You, or the car will not notice the difference. It's marketing BS.
rjp