quote:
Originally posted by archryhntng:
Running Amsoil S2k 0w-30. How low should I let TBN go. Also how far out of viscosity should I go?
They are all wrong and part right.
I am not a language expert and don't have the patience to get into it with the
LITTLE that I do know...
BUT
THERE are ERROR factors with TBN as well...
Now take the fact that if you were wise you'd have some buffer level in there..
Then take into account that not all oils drop or start out with the same TBN
And not all TBNs are the same...
You may get a TBN that shows virgin at 10 but in fact that is the BOTTLE ### and if placed into the car it is a real 9 or 8
And some drop very fast and some are steady drops
others the TBN will hold then DROP more than in the beginning
And yet others have somponents that help keep the falling TBN boosted up longer over time so here it could go from a 10 to a 9 to an 8 to an 8.5 to an 8 to an 8.4 to an 7.9 to a 8.2 to an 7.0 back up to an 8.0 to a 7.5 to a 6.9 to a 6.2 to a 6.9
as an example...
SO unless you know how YOUR oil responds and what it looks like in your engine at "X" miles
then it's just a yardstick.
a Rule of thumb or whatever you call it.
Me.. I have posted about this before... but give yourself some legroom... that's my opinion.
Oil is a CHEAP insurance policy, use it and when in doubt... throw it away