On 27/07/2020 14:14, Dave Plowman (News) wrote:
In article
,
Tim+ wrote:
wrote:
On Sunday, 26 July 2020 16:20:19 UTC+1, The Natural Philosopher wrote:
On 26/07/2020 14:47, Jethro_uk wrote:
On Sun, 26 Jul 2020 13:54:42 +0100, Dave Plowman (News) wrote:

Oddly, it can be more so on older engines. Pushrod engines have much
higher loads to the camshaft than modern OHC multi valve types. And a
worn cam may not stop it running, but will reduce the performance and
increase fuel usage.

Judging by the number of drivers I've known that failed to notice their
engine was firing on 3 not 4 cylinders, it might not get noticed ....

Dave is of course talking tosh. The load on the camshaft, all other
things being equal, does not change just because there is a pushrod
involved.

not until you use seriously high racing RPM where the pushrod mass has
some effect, anyway.

How many cars are pushrod nowadays?


Not many, but the new C8 Corvette uses pushrods.

Still quite a few cars on the road with pushrod engines.
I was merely trying to explain why is is a good idea to use the correct
oil for your engine - regardless of age. But if you by a banger and throw
it away every year, it doesn't much matter.

And mixing synthetic oil with mineral oil seems to be a really
silly thing to do. Modern cars run much hotter than they used to
which is why synthetic oils are needed, especially if the car has
a turbo where the oil gets very hot. Mineral oils cannot tolerate
these high temperatures.

Makes you wonder what happens to the waste oil tank at the local
amenity tip. People tip all sorts into this. can't see that
being re-refined and resold.