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In Reply to: RE: At your current interval it probably doesn't matter much posted by AbeCollins on July 01, 2009 at 10:07:25
Abe
You can go over by 2000 miles today and still be in good shape as long as the oil hasn't been in the car over a year where it had gone thru major climatic changes..Thats what breaks down oil more than extra miles does.
The oil is much better today then it was in the 1970s and before.This is one of the major reasons why engines are lasting much longer along with the overdrive automatic transmissions that let the car run lower rpms and higher speeds.The detergents are much better today and viscosity is much more consistent..You always here about people changing oil every 1500 or 2000 miles..This can be a bad thing because you want the older oil to coat the cylinder walls and the valve stems and bores and all main and rod bearings..This can only happen with older oil because thats when it gums up a bit that gives it that ability to stick..I always treat my engines with the teflon treatment or slick 50..They definitely work well because we have done testing such as the engine temperature dropped almost 17 degrees and the fuel mileage had gone up almost 2 mpg..Anytime you reduce friction,these things happen.Also over the course of 218k miles,we tore down the engine in the 1988 Ford tempo,and it looked brand spanking new.It was treated every 30k miles with slick 50 since new.I do that to all my cars and its worth every penny..I use the real teflon treatment but it does coat the cylinder walls and all the mains and rods and even oil passages.
Bottom line,you will be fine going over..Just dont go over by 4k miles lol.
If the power supply waveform isn't pretty,neither is the sound in most cases.
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