back before all the oil companies combined and merged...
Chevron delo oils would meet the new oil specs at up to a year earlier than Mobil or Shell. Chevron developed and patented a method for hydro treating group II dinos oils to purify them to create the ultra pure molecule for the group III oils. And they had their own additive group that led the industry. Bad news was... that when you went to buy chevron delo, its was the first one to be sold out at wally world, and most other stores as the truckers always bought it first.
Post mergers.... all that stuff was sold off and most everyone buys the additive package from one or two suppliers now and use the appropriate base oil so the oils are more alike than not.
AND particulate filters, and cats in the diesels have cause a reduction in extreme pressure additives so that now the oil is has to be a less protective in some areas as not to foul up the catalytic converters... High levels of moly and zinc are attracted to heat and will actually bond to a cat and render it useless. Shell does however market the t4,t5,t6 blends that give you great choices as to move from a group III base to a group5 base... For those who operate in the very very cold regions. And there is the push on modern engines to run a 15w-30 or 5w20 to try to improve mpg by lessening the oil drag. This is fine balance between protection and disaster by using wider bearings to support a thinner layer of film, and a pump with more capacity to account for wear over time.
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Today's Featured Article - Restoration Story: Fordson Major - by Anthony West. George bought his Fordson Major from a an implement sale about 18 years ago for £200.00 (UK). There is no known history regarding its origins or what service it had done, but the following work was undertaken alone to bring it up to show standard. From the engine number, it was found that this Major was produced late 1946. It was almost complete but had various parts that would definitely need replacing.
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