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 - Usin Your Implements: Bucket Loader - by Curtis Von Fange. Introduction: Dad was raised during the depression years of the thirties. As a kid he worked part time on a farm in Kansas doing many of the manual chores. Some of the more successful farmers of that day had a new time saving device called a tractor. It increased the farm productivity and, in general, made life easier because more work could be done with this 'mechanical beast'. My dad dreamed that some day he would have his own tractor with every implement he could get. When he rea
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