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Originally Posted by Trouthead
I have used most of the above with oil analysis. You are good in most conditions for 10-12 thousand miles on most if not all of the above. Use an oversized filter, either amsoil, or Mobil 1 and don't waste time or money changing oil too often. Oil analysis really pays off in telling you how much oil life you have left.
If you want to be super conservative, change at 8-10 thousand, and forget the oil analysis (after doing one).
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I'd agree 100%. After the warrantee had worn off I'd run mobil1 synthetic (5w30 or 10w30 if you're in a year round warm climate) at 10,000 to 12,000 miles *and* run it with an Amsoil SDF 15 filter. I'd do at least one oil analysis on *your* engine to make sure that flies but it's 99.9% sure it will.
But any good synthetic in the 5w30 or 10w30 range will work fine along with a good filter so just use what's locally available.
If you choose to run regular oil, change it every 5,000 miles but still use one of the best filters (amsoil, mobil1, pureone).
But wait until you hit 10,000 miles with regular oil until you start putting synthetic in. You'll get better gas mileage on the front side. On a diesel engine (vs gas) this is much more critical to wait until 10k.
If you use synthetic but don't change the intervals to 10,000 miles or more it's going to be more expensive and you'll be throwing away good oil. It's kind of like throwing away tires when only half the tread is worn. There may be good reasons for doing that for some people but it's a waste of perfectly good performance for most people.
Alan