Well very generally speaking, these oils have two additives in them which are more suited to older engines. The first is normally a burnoff-inhibitor which helps prevent the oil from burning off if it gets past an engine seal into the combustion chamber. The second is a "seal conditioner", the exact makeup of which I'm not sure of, but it's designed to soak into seals such as head- and rocker-cover gaskets and force them to expand. Thus if one of the seals is a bit leaky, the seal conditioner will attempt to minimise the leak. They claim that they're designed to be used in cars with as little as 75K..but in all honesty, this seems to me as one of those "if it aint broke, don't fix it" type things. If your engine dosen't burn or leak oil(which people with 120K+ proteges don't even experience) then don't pay the extra premium.shaneMazda2000P said:i dunno if i would trust the high milage oils, do they really work, are they good for turbo motors?
the 15K stuff is just regular oil with less cleaning agents than the high mileage oil(but about 10% more than regular oil).shaneMazda2000P said:wrong high milage, i am talkin abotu the 15000 mile oils that you don thave to change ur oil for that long, i think its mobile that has that one..
speed_addict said:sweet! let me know- i would be interested to know what you find out!
Blackstone Labs said:KANE: Universal averages show typical wear metals for oil from this type engine after 5100 miles run on the oil. Your oil was in use 9872 miles, and we found all wear reading around average levels and in the correct balance to show normal mechanical parts inside. Air and oil filtration (see silicon and insolubles) appear normal. This was 5W/20 engine oil with no fuel, moisture or anti-freeze in it. The TBN was 2.8, some active additive left. The oil could have stayed in use longer. Try 10,500 miles for the next oil change and check back to establish wear trends. Great engine!