quote:3k with dino oil is fine, I just have a beef with those doing 3k changes with synthetic! Although that means I need to be mad at myself, as I just drained out Royal Purple 5w30 at 2600 miles this afternoon in my wife's car. I wanted to start a fresh test with Royal Purple now that our cold weather is gone, to see how this oil can compare to the Mobil 1 she ran last year from April to November. And from now on my plans for her car are to do two oil changes per year, one right before winter hits, then one right after the cold weather goes away in the spring. So her winter oil will usually only have 3k on it, but her summer batch will be closer to 5 or 6k.
Originally posted by Green Max: Well, I did the calculations by TooSlick's formula and came up again with 3k oil change intervals for dino oil. What are the 3k oil bashers going to say, the formulas are all wrong?
quote:I got a case of Royal Purple for free, so it was $0 per quart. I know it sounds silly that I drained it so early, but it was the first run with a new oil, plus it was run through a nasty cold winter, and I want to have a good long run on Royal Purple in her car in non winter weather to see how good the UOA looks.
Originally posted by ryansride2017: Patman, You kill me. You drain Royal Purple at what, $8/quart (2600 miles?) just to "start fresh".