Greetings,
I have a 2005 Dodge Grand Caravan with 98,000 miles. From 10,000 miles to 90,000 miles, I used Amsoil Series 2000. At 90,000 I started using the then new Amsoil Signature Series. Immediately it started using oil. I went from using a quart every 6000 miles to using a quart every 2500...