So I hope we can have a discussion here to put my mind at ease. We have a 2021 Highlander, 2022 Tacoma, and now, the vehicle I'm currently working on, a 2004 Lexus RX330.
It's my understanding that the factory fill of this car is SLLC. Lexus/Toyota of this vintage (and the next ten years) have an issue where the RTV (probably three bond 1207(b?)) on the coolant inlet/valley cover plate will disintegrate and lose bond over time, resulting in a coolant leak at the valley plate.
I'm in this motor for other reasons and have decided to check the valley plate (170k miles) - and sure enough it's got some of the pink crud around the edges.
Now, I've ordered the correct "updated" sealant for this job when using SLLC, ThreeBond 1282b (08826-00100).
Since I have two other SLLC Toyotas, I guess I'd like to just use SLLC in this one as well.
It's my understanding that 1282b was developed by ThreeBond to have improved performance against the newer 'SLLC' coolant. I am guessing that Toyota saw failures of 1207(b?) after the switch to SLLC, and Toyota requested an improved FIP gasket maker, hence 1282b. The TDS for 1282b shows a date of 2009.
Also, research online points me to seeing that permatex emailed back to an inquiry about their products, stating that ultra black is the 'equivalent' to 1282b. This is interesting because previous to this, I saw a lot of mention of ultra grey OR ultra black in this application, (anecdotally near no mention of Ultra Blue).
Lastly, I saw in a post from 2020 where a forum member stated the latest up to date Toyota FSM spec'd 1207b instead of 1282b for a water pump or something along those lines - still a purely coolant environment. This surprised me.
Edit: Interestingly - Threebonds product catalog and website makes no mention of 1282b - and their catalog doesn't list anything for use with SLLC. Also - the TDS for 1207b says tack time is 8 minutes. The product comparison spreadsheet says 3 minutes. Wierd. Edit x2: I found the 1282b on the Japanese version of the site, nothing on the NA version.
Questions:
Is 1282b the end all be all with SLLC?
Was there an earlier, original version of 1207b -OR-Was 1207(b) improved at some point after the creation of 1282b?
Was Permatex Ultra Black reformulated with the advent of longer life cycle (And new/different ingredients) to offer the same performance as 1282b in coolant environments?
Thanks!
It's my understanding that the factory fill of this car is SLLC. Lexus/Toyota of this vintage (and the next ten years) have an issue where the RTV (probably three bond 1207(b?)) on the coolant inlet/valley cover plate will disintegrate and lose bond over time, resulting in a coolant leak at the valley plate.
I'm in this motor for other reasons and have decided to check the valley plate (170k miles) - and sure enough it's got some of the pink crud around the edges.
Now, I've ordered the correct "updated" sealant for this job when using SLLC, ThreeBond 1282b (08826-00100).
Since I have two other SLLC Toyotas, I guess I'd like to just use SLLC in this one as well.
It's my understanding that 1282b was developed by ThreeBond to have improved performance against the newer 'SLLC' coolant. I am guessing that Toyota saw failures of 1207(b?) after the switch to SLLC, and Toyota requested an improved FIP gasket maker, hence 1282b. The TDS for 1282b shows a date of 2009.
Also, research online points me to seeing that permatex emailed back to an inquiry about their products, stating that ultra black is the 'equivalent' to 1282b. This is interesting because previous to this, I saw a lot of mention of ultra grey OR ultra black in this application, (anecdotally near no mention of Ultra Blue).
Lastly, I saw in a post from 2020 where a forum member stated the latest up to date Toyota FSM spec'd 1207b instead of 1282b for a water pump or something along those lines - still a purely coolant environment. This surprised me.
Edit: Interestingly - Threebonds product catalog and website makes no mention of 1282b - and their catalog doesn't list anything for use with SLLC. Also - the TDS for 1207b says tack time is 8 minutes. The product comparison spreadsheet says 3 minutes. Wierd. Edit x2: I found the 1282b on the Japanese version of the site, nothing on the NA version.
Questions:
Is 1282b the end all be all with SLLC?
Was there an earlier, original version of 1207b -OR-Was 1207(b) improved at some point after the creation of 1282b?
Was Permatex Ultra Black reformulated with the advent of longer life cycle (And new/different ingredients) to offer the same performance as 1282b in coolant environments?
Thanks!
Last edited:
