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I had an analysis done for my '03 Jeep Grand Cherokee. I'm using Mobil 1 5W-30 and I sent the analysis in when the oil had only 3k miles on it. According to Blackstone Labs, my oil shows typical wear metals for an oil with 5,500 miles on it . They also noted the lead from bearings was higher...

My sister has an '03 Mazda RX-8 with the Rotary engine in it. It uses 5-W-20 dino oil, synthetic is not recommended by the manufacturer. Last winter while she was checking the oil she noticed it was milky in color. The car gets driven about 20 miles each way to her work and about 30 minutes...

My wife's car (actually my old one) is a 92 Nissan Maxima SE with 126k miles on it. This is the engine that has the troublesome VTC assemblies but that is another story. Anyway I was looking into the oil filler hole tonight and noticed that inside the valve cover area where I could see there was...

I have an '03 Jeep Grand Cherokee with the 4.7HO V8 in it. I've ALWAYS changed the oil in my cars at 3k miles no matter what, even with synthetic. I'm using 5W-30 Mobil 1 in it now and since it was 6k miles old. My question to you guys is this. Is it better to go with 3k mile change intervals...