[928uk] Valvoline VR1

[Paul R Smith]

I think that should be 2023, (2013 is probably a typo,) when I pointed 
out that finally Porsche had recognised that 928s need a -50 oil.
And I think we recently established that the new formulation of VR1 is fine.

The wording about the Porsche Classic 10W-50 are Porsche marketing's 
words, so I would suggest that the implication that it is the best, is 
just marketing talk.

The reality is that in our climate you don't need a thin "winter" grade 
for cold starting, so a 15W-50 or 20W-50 is fine. Then consider that the 
more viscosity modifiers an oil needs to make a bigger difference 
between the two numbers, the shorter it's life is, then it makes more 
sense to stick with a 20W-50.

Also remember that the ZDDP doesn't start to lay down it's protection 
until the oil is 80 plus degrees, so you need to get the engine fully 
warm every time you use it.

I would be confident that the Porsche 10W-50 is good, but probably 
vastly overpriced at £90 for 5l. And I don't think Porsche deserve our 
money when they recommended -40 oils for so long when we all knew that 
the 928 needs a -50.

Smiffy

On 24/06/2024 00:42, Donald Peach via 928uk wrote:
I think that at one stage Valvoline VR1 SAE 20/50 engine oli was 
recommended for our V8s due to the high zinc content. Looking at the VR1 
Racing Oil now, it seems it is a new formulation, but still with a high 
(? high enough?) zinc content. Is this still okay for the 928, or should 
I go with the 2013 article on the 928.org site which seems to suggest 
that the Porsche Classic 10/50 might be better?

Best regards,

Don.