You guys are getting me so worried that I may never start my B up
again. Maybe I'll just bronze the thing. :-)
CR
On 1/29/2013 3:01 AM, PaulHunt73 wrote:
> My thoughts exactly ever since I started looking into this about four
> years ago, which is why I just don't trust it. Castrol GTX even though
> sold under it's original API spec only seems to contain half the zinc
> and phosphorus it did originally. I've seen a letter purporting to be
> from Royal Purple stating that RP XPR 10W40 has over 1500-1600 ppm of
> ZDDP and goes on to say "we could take all of the ZDDP out of our
> engine oils and still have 4 times the wear resistance of even the
> VR-1 oil due to our Synerlec additive technology". It which point the
> whole thing degenerates into farce. What was apparent when I was
> looking is that Diesel oils, if they had a petrol API rating as well
> as a Diesel, contained more ZDDP than oils with only that petrol
> rating, but that was also under review. In the UK I use Comma Sonic
> which is to API SL but has .2% zinc and .19% phosphorus
> http://www.commaoil.com/productsguide/file/367670c3e9a411571893883585a71863
>
> PaulH.
>
>
> ----- Original Message -----
>> Can someone explain how Valvolene's VR1 meets the (claimed) SN/SM/SL
>> rating, yet contains the claimed 0.14/0.13 Zinc/Phosphorus? As far as
>> I can see, any oil rated higher than SL MUST contain less than .12%
>> Zinc and Phosphorus.
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