For the most part any engine newer than 1960's has seals (non hemp seals) that are compatible with good modern synthetic oils (like AMSOIL). There may be off brand synthetics that aren't seal compatible but I doubt it. In almost all testing (3rd party), car, truck or motorcycle AMSOIL always beats Mobil 1. That said Mobile-1 usually beats a lot of others. However, Castrol GTX (regular NON synthetic) beats Mobil 1 for volatility testing. It is also (at wholesale $) the same or less than Mobile 1 at the store but definitely not 2-3x more.
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Today's Featured Article - New Life for an Old Allis - by Tyler Woods. My friend Jon, has an old '39 Allis Chalmers B. He thought it a marginal tractor that had long since served its time. She smoked terribly and never had much power but he couldn't afford another so he was limping along with what he had. Jon's Allis has a small front loader and though it doesn't carry much, it serves his needs. It was the hard starting and low power that made him think it was time to replace the old girl. Jon called me to help him discover why his tractor wouldn't start
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