I have a 2001 Pontiac Grand Prix GT coupe. it has 200,000 miles on it. it runs like a champ but I'm wondering if I should start to use thicker motor oil. if so what is the best weight to use?
I would stick with the recommended viscosity, but I just changed to Valvoline Max Life Synthetic blend. I could actually "feel" the difference in the way my 37 year old engine runs. That stuff is super-slick.
that's pretty much exactly what I ended up doing and you're right you can feel the difference. I'm well on my way to 300,000 miles. thank you
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