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For some reason the Japanese have been very slow to embrace synthetics. I've been told it has nothing to do with the oil itself, but rather their Engineers are afraid that if they do endorse the synthetics, the truck operators would not do the other maintenence that the the trucks need every 7,500 miles, like grease, checking brakes, belts, hoses, etc. They believe that most operators (especially the Americans) would just run the trucks until 15,000 or so and check everything when they change the oil.
I can't say I blame them, the Engineers are probably right. We'd run the darn things until some ungodly mileage before touching the trucks (because the synthetics would let us) and when something broke because we did maintain it properly, we scream warranty! Been there seen it happen many times.
The synthetic oils won't hurt anything as long as you don't negelect everything else. The differentials already run synthetics and there is a option for synthetics in the Allison transmission as well on the US build products.
I can't say I blame them, the Engineers are probably right. We'd run the darn things until some ungodly mileage before touching the trucks (because the synthetics would let us) and when something broke because we did maintain it properly, we scream warranty! Been there seen it happen many times.
The synthetic oils won't hurt anything as long as you don't negelect everything else. The differentials already run synthetics and there is a option for synthetics in the Allison transmission as well on the US build products.