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The last five oil analysis from my 2500HD Silverado. Engine is the LQ4 iron-block gas 6.0L V8. This truck is used almost exclusively for towing a racecar around the country, so lots of long highway slogs with a ~ 6,000lb load. It's a four speed auto with 4.11 gears, and it definitely turns some...

Guys - this engine has produced a lot of iron since new, but the lead coming up is a new phenomenon. Thoughts? This is my wife's daily driver. Mixed city / highway driving, but no particularly hard use. You can see where I switched from 5W30 Amsoil to 5W40 Amsoil. I did this because the engine...

Here are the last four oil analyses for our '02 Jetta 1.8T. Prior to this I followed a 5,000 mile OCI for this car, and we have always used either Mobil 1 5W40 or Castrol Syntec 5W40. Given that this car sees mostly highway miles (50+ mile commute each day plus numerous sales trips within a day)...