Originally Posted By: FordCapriDriver
it's by a company called Comma and it's a Mineral 20w50 specially designed for classics the API rating is SE
"Specially blended for Classic Cars from the 60's, 70's and
80's where an oil of this quality and viscosity is
recommended by the manufacturer."
Sulphated Ash Mass 1.1%
Zinc 0.08%
Calcium 0.22%
Phosphorus 0.07%
SAE 20W-50
API SE CC
This oil doesn't look very special to me, I would stick to the Shell HX3 or the Valvoline VR1 20W-50. I read in a valvoline PDS that the VR1 had 1400 ppm Zinc (0.14%), this is a solid dose. If you can get VR1 for much the same price as HX3, then I would go with the VR1 next time. I think Joe90 was having a problem with the Selenia oil, not the VR1, but he can correct me if I got it wrong.
Sulphated Ash doesn't give you total zinc, but it's a good indirect indicator of the inorganic (metallic) additive package which can include TBN, Zinc, etc For comparison
Castrol Edge 10W60 has a sulphated ash of 1.29 [TBN =11.2]
Castrol Edge 0W40 has a sulphated ash of 1.15 [TBN >10]
Castrol GTX 20W50 has a sulphated ash of 0.8 to 0.99 (depending on which PDS you read). [TBN = 6.3]
I think in the old days GTX was higher, which is why a lot of the modern 20W50 oils are considered "watered down", but I like Race oils like VR1 as they are "dosed up". But it is really hard to get solid figures out of anybody.
Elf make a few 20W50 mineral oils like Evolution 500FT which they say has "very high anti-wear" properties.