I used Amsoil Series 3000 5W30 in the '85 wagon when I drove it across the country over the summer (Boston to Seattle). It never used a drop except for the day I drove from Missoula, MT to Seattle -- climbing several major mountain passes in western Montana and Idaho in 100F heat with a massive load in the car caused oil temps to shoot sky high, and the 5W30 must have just gotten so thin that a bunch slipped past the rings and valve guides. I was down about 3/4 of a quart at the end of that day. If I had had a proper oil cooler rather than the dumb VW coolant heat exchanger in the car I think things would have stayed better under control, and I might run 15W40 Amsoil marine grade oil in the future during the summer since my cars are often subjected to very hard mountain driving with big loads in hot weather.
Starting to prepare the 745 for another long trip, from Seattle down through Wyoming to New Mexico then back via LA and up through California, in the middle of January. Will probably run 5W30 for that one.
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86 745 D24T/ZF 345k lifted 2.5"
83 764 D24T/M46 155k
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