The Top Tier fuel program was developed by auto mfgs, to guarantee a standard min fuel for their cars. Although the mfg don't require the car to use Top Tier, they certainly endorse it.
Both AAA and Consumer Reports endorse the use of Top Tier for those cars which it was developed. I don't think it is limited to a marketing hype, similar to STP back in the 60s. STP did nothing for cars lubrication, and in a few cases caused problems for some engines which were prone to sludge generation. Top Tier fuel additive package is designed to reduce carbon deposits.
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Today's Featured Article - Massey Ferguson 35 (and up) Tractor Assembly Notes - by Jack Wetmore. These assembly notes are for Massey Ferguson tractors with a two stage clutch and 6 speed, 8 speed and mutli-power transmissions. I see a lot of discussion forum messages regarding damaged clutches from improper assembly. The objective is to have the engine and transmission slide together safely and easily until the gap between the two halves is less than 1/4", BEFORE tightening any of the bolts holding the two together. Using bolts to draw the two halves together will damage the PTO
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