Quote:
Originally Posted by flatjack9
Thanks for the info. Every reference on here about Rotella called it a diesel oil.
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Quote:
Originally Posted by Mike51Merc
.... they call it diesel oil because it is not approved for modern gasoline engines.
That doesn't mean it is not approved for old gasoline engines.
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Guys,
Shell openly admits that since the advent of catalytic converters,
they market directly to diesel owners due to not really having a market of people who don't have catalytic converters.
The gasoline market dried up so no real use in pushing it on 2015 vette owners.
If it didn't harm your beloved catalytic converters, it would still be an excellent oil across the board (including and most importantly, engines with hi perf flat tappet cams and engines without hardened valve seats).
The truth is, all manufacturers reduced the amount of zddp and phosphorus because it plugs your favorite exhaust parts.
One last note, Rotella T (the original blend) comes in straight weights just as Henry Ford recommended for our Flatheads.
-Straight weight 10w winter and 40w summer
Rotella T3 comes in multi weights 10-w30 and 15w40 etc.
Rotella T3 includes even more zddp and phosphorus than the original Rotella T straight weights.
That's about all there is to it.
From the Petroleum Quality Institute;
Independent Testing
.