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    Antique vehicle Engine Oil

    Older, pre-emission-control models have been using engine oil intended for diesel trucks, e.g., Shell Rotella T, with the understanding that this type oil contains the additive zinc dialkyldithiophosphate (ZDDP), which does two important things for older cars: 1. Increased soot control 2. High...
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    Diesel & Auto-RX

    Have a 173K 7.3 Ford Diesel which is used for relatively short trips (limousine business) 20-30 miles, with idling done for 2-3 hours at a time. Driven less than 150-200 miles in a weekend. Less than 3000 miles in 2 years. Have moderate oil consumption currently, smokes a good bit when idling...
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    Cleaners and Diesels

    Which cleaner would be better for a 174000 mile 7.3 Ford Diesel? 131 or RX? Currently uses about 1 quart of oil every 3-400 miles, there is a lot of idling during use. Guidance on procedure given high crankcase capacity?
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