The work described in this report is part of a long-term program to evaluate the performance of methanol-fuelled vehicles. Six Ford Escorts which were modified by the manufacturer to run on fuel-methanol have now been operated for 1 year in normal long-distance service using 3 different test oils. The oils were formulated with proprietary additive packages, one supplied by Shell and 2 others from outside companies. The formulations had been identified from earlier phases of the study as promising a level of protection for the special needs of methanol engines. The results indicate that the 3 test oils are equivalent in performance and better than the Phase 2 oil, over the duration of the study in their effect on cam and lifter wear, ring wear, and, to lesser extent, cylinder bore wear, engine durability, and cleanliness in a mainly highway-style, long-trip distance accumulation mode. In contrast to the more severe short-trip distance accumulation test performed in Phase 3, the results for the present test were not significantly worse than expected for an equivalent gasoline engine, but with an oil drain period reduced by approximately 58%.