Duckhams Q

[FCD]

For me the ultimate 20W-50 for flat tappets is Valvoline VR1, not too expensive, has 1300ppm of ZDDP, shear resistant and with a good Detergent package aswell.

 

[SR5]

Originally Posted by expat
Originally Posted by SR5
Interesting web page, looks like they are going for the classic market with API SJ 20W-50 and low detergent SAE 30 & SAE 40.

They don't give too much away
Quote
Through careful selection of oxidation-stable base oils and additive technology, Duckhams Classic Q 20W-50 protects from bearing corrosion and prevents sludge build-up.
Duckhams Classic Q 20W-50 is formulated specifically for vehicles manufactured from 1950 - 1989 and also older vehicles where full-flow cartridge filters have been retro-fitted.
Optimised ZDDP ("zinc") level for engine component wear protection is a leading feature of Duckhams Classic Q 20W-50
API SJ/CD performance level
Original, distinctive "Duckhams green" colour


I would like to know what their optimum zinc level is. I assume oxidation stable base oil is Group II, but it would be nice to know for sure.

I like how it's their traditional green colour.



Duckhams on ZDDP https://www.duckhams.com/zddp-what-does-it-all-mean/

A good write up but no figures.


Yeah they say
Quote
The 0.12% maximum concentration of ZDDP has been shown to not only be compliant with the regulations, but also provide perfect amounts of anti-wear protection whilst also being at a safe enough level for catalytic converters.


and

Quote
Optimum levels of ZDDP are correct NOT maximum levels.


but no real numbers given.

 

[SR5]

Originally Posted by FordCapriDriver
For me the ultimate 20W-50 for flat tappets is Valvoline VR1, not too expensive, has 1300ppm of ZDDP, shear resistant and with a good Detergent package aswell.


Hi FCD,

You know me, I'm a Penrite HPR 30 guy myself

Penrite HPR30 (20W-60) mineral
API SM, ACEA A3/B3
KV100 = 25 cSt
Ca = 3630 ppm
TBN = 11.1
Zinc = 1530 ppm
SA = 1.47 %

But I also like their Penrite Vantage 10W40 semi-synthetic (Group II and Group III),
API SN/CF, ACEA A3/B4, MB 229.3, VW 502/505, RN 0700/0710
KV100 = 13.5 cSt
TBN = 11.0
Zinc = 1220 ppm
SA = 1.1%

 

[Silk]

I used to use Duckhams in my Triumph twins back in the '70's. I remember we were blown away when Ivan Mauger used it in his speedway bike...a bit suspicious as a speedway bike runs on alcohol and so needs castor oil. But then total loss, so maybe it didn't matter.

BP's first synthetic, Visco 5000, was the same oil as Duckhams, just not green.