Should I request a TBN?

Joined
Apr 7, 2004
Messages
230
Location
South Carolina
Getting ready to send off my first sample to Blackstone for a UOA on my 2005 Tacoma. Original OCIs were 3k but wanted to try 5k to see how the Castrol GTX 5w30 looks. The info from Blackstone suggest getting a TBN if your interested in extended OCI. Not sure if that means beyond my sample mileage or not. Should I get the TBN?
 
Joined
Mar 22, 2005
Messages
575
Location
Pa
If its your first UOA on this engine, I'd just get a regular one. 5K isn't really an extended drain unless its all short trip driving.
 
Joined
Oct 10, 2005
Messages
632
Location
Idaho
Yes, go to 5K and do the analysis with the TBN. Then post it...Like I did a few of mine and see what the folks say. If its good for a few K more...go to 7.5 K and you know the oil will get there worry free.
 
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