Rotella 15w40 in everythng and a little lucas oil additive in the ones that have been abused.

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Ncnetman
1959 Chev 3100 Fleetside
1965 Mustang
1968 Torino GT fastback
1969 Ranchero
1974 240d 4-speed -for sale
1976 240d fresh paint- on hold
1978 300cd fresh paint and new rearwindshield rubber
1990 6.2 Suburban 194k-getting a 6.5 turbo
2008 Duramax Silverado
2015 VW Passat TDI