Originally Posted By: pitzel
Originally Posted By: NHHEMI
I can guarantee you that no auto mfg will ever deny warranty coverage because you changed the oil too often.
The ONLY way it might come into play is if you have a situation where the mfg actually uses a break in oil or additive( some Hondas come to mind ). Changing that early could possibly cause you some grief. Most auto mfg's do not use special break in oils or additives however and if you want to change your oil every 1K it will have no bearing on your warranty.
So when the vapours from brand-new motor oil evaporate and get ingested into the intake through the PCV, where do they go? They go towards gunking up the throttle body, the intake idle air passages, the intake passages, and on some vehicles, even the intake valves!
The idea behind not changing oil overly frequently, and following manufacturer's reommendations is to minimize the amount of these vapours that hit the PCV system, since the volatility of motor oil is at its peak when its brand new.
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Also, changing your oil often is going to have no effect on instrumentation( I really don't get this one? ), 02 sensors, cat's, etc... The only way 02 sensors and cat's are effected by oil is if you have blow bye. Otherwise oil never touches either. Also not sure juste xactly what you mean by intake issues with changing oil too often either. No clue on that?
The 10% or so of a fill of brand-new modern oil that 'dissappears' during the ASTM 5800 ("Noack") test ends up in exhaust. This oil contains a phosphorous component that is damaging to instrumentation and cats. Its a well-documented issue, and all the evidence to date shows that phosphorous-based off-gassing from motor oil is, again, the highest during the initial period of service, and tapers off as the oil has been broken in.
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IF you say so.