On Monday, 2 March 2020 15:32:49 UTC, Dave Plowman (News) wrote:
In article ,
Andrew wrote:
Cheap oil is not synthetic. Modern cars run at much higher temperatures
than mineral oil can cope with. On old cast-iron lumps it is the wear
on things like camshaft lobes that might be more of a problem if you
use the wrong oil.

Valve train wear on an old pushrod design is due to the higher loading
than an OHC type, and minimised by a suitable additive. Normally ZDDP.
Which can be used with mineral or synthetic. It's not a common additive
these days as catalytic converters don't like it. But you can buy
specialist oils with it, for use in older cars.


Proper cars have hydraulic lifters that need no adjustment.