[Oletrucks] expensive but good oil for flat tappet

[mark]

http://www.mobiloil.com/USA-English/MotorOil/Oils/Oils_FAQs.aspx#Mobil_1_Racing_Oil_FAQs4
...Racing oils are formulated with anti-wear (Zinc/Phosphorus)
chemistries at twice the level of automotive street oils to provide
enhanced protection of highly loaded valve train systems found in some
race engines. ...

expensive!!!!
http://www.mobil1racingstore.com/buyracinglubes.html

this oil is full synthetic.