How far should I go on this oil change?

wtd

Messages
2,693
Location
southwest Mo.
before I do an oil analysis? I've got 4,000 miles on the 10W-30 Mobil 1 in my 98 chevy truck with the 5.7L. I've got a 3oz maintenance dose of Auto-RX in this oil and this is the first oil run since I did the initial full bottle of Auto-RX. This will also be the first analysis of 10W-30 Mobil 1 in this truck. So when should I change it out to see how well its holding up? Wayne
 
Top