Yamaha and Honda's current crisis has led Dorna Sports to consider reviving manufacturer concessions in a bid to help the struggling Japanese brands.
But Oliveira believes teams with more bikes should face restrictions, and struggling smaller teams should be given more test days and tyres than those seeing success.
The RNF Aprilia rider raced under concessions at KTM, with whom he competed with at Tech3 in 2019-20 before moving up to the factory team for 2021-2022.
Speaking to Autosport at the British Grand Prix, he said: “My opinion is we should create a system where, first of all you create an equal technical approach into MotoGP racing.
“That starts with the number of the bikes on the grid. I don’t think now the championship has allowed Ducati to have eight bikes on the grid that you should take them off the grid.
“But at least try to find a balance, because we know track time is valuable and if you have eight bikes then you get more data than the other manufacturers. It’s a matter of strategy.
“I believe that if you have more bikes you would have to be much more restricted in terms of homologations, in terms of testing days, in terms of who you bring to the tests and the tyres that you use in the tests.
“That also maybe applies to the manufacturer that has two bikes. Maybe that manufacturer with two bikes on the grid, who is struggling more, maybe give them more test days, give them more tyres to test, more chances to actually bring a plan down to get valuable track time.”
Source: Autosport