An important question to ask is how many miles between oil changes. Zinc gets used up with miles driven. A good High Mileage oil might be fine in a street-driven Flat Tappet engine for 1000 miles/1 year between oil changes. Drive more miles, though, and more Zinc may be required.
sorry, should have been "rating".HTHS "rates"? HTHS is not a rate and it is not associated with an API license. It is however associated with an SAE grade.
Yes ZDDP is old technology but it is still highly useful and also note it hasn't actually been replaced, for a reason. But I definitely agree that chasing one isolated element (decomposed from a compound in a $30 spectrographic analysis) isn't necessarily meaningful in light of the oil's overall performance. That's why approvals, specifications and licenses exist as they certify the formula's overall real-world performance.sorry, should have been "rating".
i think everybody should stop chasing technology that is 80 years old and has successfully been replaced for at least 20 years.
we should not start looking for high levels of phosphorus, sulfur and zink because the editors of "hot rod magazine" found out zddp existed. we dont use oil based paint anymore or pour tetraethyllead in to the gastank.
another trap to fall into is to go for diesel oil. it has different zddp than used for gas engines (among other incompatibilities).
I change the oil once a year on three of my cars. ‘68 Skylark, ‘89 Mustang, and ‘04 BMW. I don’t think any of them see 1k miles in the year.An important question to ask is how many miles between oil changes. Zinc gets used up with miles driven. A good High Mileage oil might be fine in a street-driven Flat Tappet engine for 1000 miles/1 year between oil changes. Drive more miles, though, and more Zinc may be required.
Decent price ? Or just get Amsoil Z Rod and leave it in the sump for a very long time …Where do you get 1200 PPM Zinc nowadays for a decent price?
That would be perfect for my classics. Thanks in advance!
What sae rated off the shelf oil for passenger car use has ever had too much ZDDP? But I will agree too much of any thing gets to the point of a diminishing return and can do the opposite of what is intended.Remember that you CAN have too much ZDDP. I would PM @High Performance Lubricants and ask Dave what he recommends. I believe he will tell you not to change based on time, as your throwing his oil away changing every year if you're not driving much.
I was referring to the various ZDDP additives available. ZDDP is good, so dumping in more is better, right?What sae rated off the shelf oil for passenger car use has ever had too much ZDDP?