Addicted to Fun and Learning
- Aug 25, 2020
Popular Mechanics (I think) did a test where they concluded that it was fine to double the oil change interval if you just changed the filter, so that is what I did from that point on. It never caused a problem, but I seldom kept a car for more than a year or two.As a mechanic for well over 40 years, using oil analysis to do oil changes, the 3000 mile oil change was a myth (unless you had a VW Beetle that did not have any oil filter from the factory & was air-cooled, therefore running hotter or only drove on dirt roads & off-road). Since synthetics arrived in the early 70's (Amsoil) I have personally limited even my hotrod cars to one oil change a year (the oil analysis shows that I could go longer) but I believe that condensation due to weather changes & short run times (going to a grocery store 10-12 minutes from home, not allowing a long enough run to maintain operating temperature long enough to evaporate the condensation in the engine) would cause problems in the long run.
All my cars, (models from a 1968 Chevelle SS 396 to a 2012 Lexus [currently 30K miles], even my hot rodded Beetles (that were making 50 to 75% more power than from the factory), have gone 200K (some 300K) before needing an engine rebuild. The 3000 mile oil change was perpetrated by the oil companies & filter (oil & air) manufacturers (who enlisted the new car manufacturers to put short oil change mileage or times in the owners manual, to sell more oil & filters.