VW Air-cooled Beetle 1302 maintenance

Long deserted motor oil exchanging in VW Air-cooled Beetle 1302 was performed today. TOYOTA genuine Castle mineral oil 5W-30 is prepared with 2.5 L amount, remembering my past when I was in 1200 cc standard model applying Kendall 20W-40 Paraffin series base oil.
As a trial attempt I poured Motul 5W-30 Synthetic oil in AD motor, though idle speed was observed reducing slipping resistor, motor mechanical noise was increased in stead. Too thinner lubricant layer revealed backlashes everywhere in the motor construction. As my one sided opinion, thin layer of lubrication does not meet with a old designed motor while the period of no Synthetic development had not been done.
Consequently, I replaced Motul Synthetic oil into conventional mineral oil relatively soon.
By the way, most of the Air-cooled Beetle has some motor valve hitting noise, as I adjusted it at minimum clearance, so my Beetle's hitting noise is not discerned. Valve hitting noise means the lack of valve lifting at the portion leading power loss. This is why I did it so.

As for the front axle construction in Beetle 1302, Strut method is implied and the stabilizer also play a part of front lower arm that is often utilized even now especially in A and B segment automobiles.
A simplified construction in not always good at accuracy and stability.
Even with the inferior condition, indispensable steering stability increases dramatically if the wheel alignment and axle construction are firmly adjusted especially on Thrust angle into Zero degree.
The importance is just reproducing the actual driving condition while measurement and adjustment especially driver's and navigator's body weight, because the weight distribution affects much on the datum obtained. Also, relieving all the stressed distortions in every adjusting scenery is indispensable for precise alignment accomplishment, however troublesome and boring it might be.
Another fluctuation factor that is often overlooked is spotting distortion and deformation of the tire tread surfaces, in 15 minutes parking on the same place is enough to affect some discrepancy, in order to avoid this artifact, increasing tire pressure up to 280 kPa temporally  is effective.