Quote:
Originally Posted by MidniteTRD
true but if i can find it, i've seen info that seems to inidicate its an exponential slope - once TBN starts to take a dive, it does so fast until its effectively depleted. like you said i'd probably aim for 7-8k and no more, especially since i tow and load it down pretty good in our hot climate.
in any case, the longer i can go before i have to be under the truck screwing with all the skidplates and stupid canister filter the happier i am!
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But...there are also data indicating that TBN depletion is not linear...it's also heavily engine dependent. As a normally aspirated non turbo engine, our 4Runners are very easy on oil.
