Its just a suggestion but you may be able to stretch the oil and filter changes a little further with no detrimental effect on the engine. To do this on a reasonably well informed basis the oil could be tested at the 10,000 - 12,000 mile change having maintained the 3,000miles interval on a regular basis during the engine settling period. The service interval could perhaps be extended to 4,000 - 5,000 miles and the oil retested and changed. To me a top quality oil with a quality filter should be good for 6,000miles (10,000km) but the unknowns in the equation are :
(1) Run in / engine settling temporary wear and deposits - reducing with run hours
(2) Continued clutch and transmission wear - particularly the wet, shared lubricant clutch.
Oil testing has provided the basis for significant down time reduction and $ savings for transport companies however by pass auxillary oil filters are also commonly used. I guess any decision on the need for oil testing would be based on how hard the engine is working, cost / time savings and mileage per year. If its all just " Mind over matter" ie " I don't mind cause it don't matter" then simple, "no doubt" oil and filter change intervals @ 3000 miles should definitely allow doubt free flying.
Last edited by Lenz; Apr 7th, 2006 at 8:46 pm.