Originally Posted By: Badroberts
A lot of companies do publish that information, they are called product/technical data sheets. A lot are easy to find online.
Yes a lot of companies publish TDS and yes I do search for them on line, a lot, maybe too much.
But I can't recall one TDS that has all that data listed above, only a subset. Try finding the Noack % of M1 and PP or the zinc levels of Castrol GTX and Edge, or the HTHS of Valvoline SynPower and MaxLife, or the TBN of regular M1 Vs M1 EP, on a datasheet from any of those companies. (from memory - but you get the idea).
Some Castrol sheets are particularly rubbish, as the figures they give are not the true value of their product, but rather the min/max values set down by the J300 standard. All they are saying is "we meet the requirements of SN" in a round about way. Thanks Castrol.....I sort of knew that by the big API SN on the bottle.
At the opposite end, some M1 and Valvoline TDS are very good, with many, but not all, of the above listed.