Cruiserdrew
On the way there
I have been running Delo15w-40 in the 60 and 62, however, because of this issue, I switched the FJ62 to Mobil1 15w-50, which Mobil recommends for flat tappet motors on their website. When the 60 is due for a change, I'm not sure what I'll do.
It may not make any difference other than peace of mind.
With regards to the chemistry of the whole thing, I believe its the Phosphorus that's the problem for the catalyst not the Zinc.
My last summer brew for my FJ40 was 5 guarts of Chevron Supreme 20w-50 and 3 quarts of Valvoline Racing 20w-50 to try and bump the ZDDP content. Probably do the same this year.
It may not make any difference other than peace of mind.
With regards to the chemistry of the whole thing, I believe its the Phosphorus that's the problem for the catalyst not the Zinc.
My last summer brew for my FJ40 was 5 guarts of Chevron Supreme 20w-50 and 3 quarts of Valvoline Racing 20w-50 to try and bump the ZDDP content. Probably do the same this year.