My VWs (both with 1600DP) live in a moderate climate, so I use Joe Gibbs 10W-30 conventional oil with high ZDDP designed for classic vehicles.
Available from Amazon → https://www.amazon.com/Gibbs-Driven-Racing-10W-30-Conventional/dp/B003XUF7IE/ref=sr_1_21?dchild=1&keywords=joe+gibbs+10w-30+hotrod+oil&qid=1586140024&sr=8-21
For what you've already got on hand, I'd go with the 5W-30 Penzoil and add ZDDP if you have it. Unless used in a hot climate or a high-mileage motor, 50W oil can run overly hot by not allowing enough oil to be routed to the cooler.
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'67 912, '70 911T, '81 911SC, '89 3.2 Targa - all sold before prices went crazy
'25 BMW 230i coupe - current DD
'67 VW Karmann Ghia convt. & '63 VW Beetle ragtop - ongoing projects
Last edited by rcooled; 04-05-2020 at 07:59 PM..
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