<<It also comes in 20W-50 multi-vis, which is what the GTX I've always run is.>>
Castrol HAS NEW product slowly creeping into stores that DOES have the ZDDP
levels out motors need. Just read the bottle; says something like "...for
older/antigue vehicles ...re-formulated...". Bottle does NOT (or so they said
to begin with) "look" different. My Machine Shop has it. You can check this
out on their site.
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