Doesn't the API ratings allow more ZDDP in higher viscosity oils? I
thought I read something about that when the ZDDP flack first started.
Charles Hill
On 1/29/2013 5:46 PM, Paul Osborne wrote:
> Ok, here we go . I'm going to be the wrench in the works. 6 years ago I fully
> rebuilt an 18V engine and placed it service in my 74 BGT. This is a daily
> driver, no show car here , nice but a driver.
> The clock reads 72000miles. since that time I have done the regular maintance
> , a set of brakes and tires . Now I drive about 500miles to my cottage all
> most 3 times a month from may to oct.
> I use Quakerstate 20w50 oil. only I have noticed nothing but running
> well. My opinion, may there is a need for this additive, maybe it may
> help, but I owen and have owen 5 mgs . my GT
> I bought new, and I see no adverse problems with the oil I use in my cars.
>
> Oh well.
>
> paul o
> On Jan 29, 2013, at 2:24 PM, Charley & Peggy Robinson wrote:
>
>> 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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