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Originally Posted by jqaq Thinking of switching to synthetic oil. Any impact on warranty if oil changes (with synch) are done every 10K instead of 5K? I paid up for an extended warranty so I don't want to do *anything* that could void it...
jq |
if you care about your engine, change your oil and filter between 3000 and 5000 miles no matter what type of oil you use, and even if the warranty and manual say it can go longer
the only time even close to being ok to go over 5000 mi. is long trips on the highway in always clean air, or when you
don't drive in extremes like high temps, low temps, short trips or stop and go trafic,
all oil breaks down (syn. oil takes longer and has better protection at the extremes) BUT, the main reason you have to get that oil out is that internal combustion engines produce acid like by products that end up in the oil, those by products along with a portion of dirt, etc. that gets by your air & oil filters wear on internal components like bearings surfaces.
with modern engines using the recomended weight / type oil is important, tolerances are closer then ever
for example the three valve 4.6 in the GT has variable valve timing that is controled in part by oil flow & pressure, if the thickness of oil used is not what the engeneers calibrated the system to work with, this function or whole engine may not run or wear correctly
I always use Mobile1 full syn every 4-5 thousand miles, a very smart person who knows oil told me a simple way to compare syn oil with petrol based oil.
syn oil is like a bunch of similer sized ball bearings between two surfaces and petro based oil is like a bunch of different sized and shaped X's between two surfaces
Synth oil and warranty 
