Redline 10W-60

[Rough Edge racing]

 the lifter directly lifts the pushrod...With a cam mechanism the tappets or lifters are also known as followers...But generally a follower has roller acting on the cam.

[sib]

And yet, in spite of that, it is Guzzi's recommendation.  Hmmm I wonder why that is?

Note that MG's full recommendation is not just any Castrol 10W60 but Castrol 10W60 API SG.  That implies that it is a high-ZDDP oil.

[Two Checks]

Quote from: moto-uno on June 06, 2021, 12:19:30 PM

As long as there is clearance (anywhere) in a valve train the term tappet ( it is a tapping sound after all ) seems appropriate .
Most roller lifter valve trains are hydraulic and by nature maintain zero lash , so no tappey tappey :) . Peter

Matters not if solid or hydraulic, if they are flat people call them tappets.

[Two Checks]

Quote from: Rough Edge racing on June 06, 2021, 06:12:53 PM

The big deal about ZDDP comes from hot rodders and racers running older tech OHV V8's. Open valve spring pressures can be 250 pounds or as much as 750 pounds...How much sping pressure is in a stock pushrod non high performance Guzzi? Generally a guy rebuilding a stock flat tappet engines used a High ZDDP break in oil and then a better mineral oil, nothing special...But proceed at your own risk...
 Oh, flat tappets are not flat and the damn things are lifters 

And how many problems did Guzzi have with hydraulic lifters?

People have had problems with stock non hi perf engines upon break in due to lack of zinc in oil.

In fact, on engines with high lift/high ramp rate cams they usually have dual valve springs. It is recommended break in is done with only one spring installed.

[berniebee]

I always thought they were called tappets because Gork the alien from the planet Gesundheidt called them tappets .

 Dusty

Nah, that's a rumour started by Awchooo, the Gesundheit leader. Tappets were invented on the planet KlickshueThreeFour by Phred Azzstare.
(Tap it. Click shoe...Never mind.)