Oil Stars

Oil stars are large stellar objects that are 70%-100% made up of oil, these " stars " remain dormant for most of their life and never exceed a average surface temperature of 12c. They are extremely bright when lit however, and the brightest star in the night sky was Masue-18. When it reached it's maximum magnitude of -4.62. Oil Stars are also notable for their extremely active nature, as they will eject stellar flares and prominences which are roughly 1.8x-5x the size of earth. These stars have been studied and have been selected to have a active space colony to harvest it's oil ( note they will only harvest oil form dormant stars. )

Pre-Proto Stars
During it's first stage of formation, mass clouds of hydrogen and carbon will merge together and become significantly denser as it collapses in it's own gravity. During this stage, 2 layers develop, the outer layer being the oil shale layer and the inner layer is the solid oil layer. Depending on the mass of the pre-proto oil stars, the less massive stars will only have their inner layer be extremely thick paste while the most massive stars will have their cores even harder than steel. This is also the stage where more massive stars will begin to generate heat form the density of the star, up to 89c at some of the least massive stars and 190c at the most massive, however this temperature is still too cold for any ignition to occur. The outermost layer is called the oilsphere as it's temperature reaches 8-20c.

Proto Star
As it absorbs the last amount of oil/ gas leftover form the hydrocarbon cloud it developed it, it beings to develop a third layer which is called the Renosphere, this layer will become the outermost layer which will cause immense pressure on the core which in all cases, will now become a solid. The internal temperature will also rapidly rise to 300c in the most massive stars and 179c in the least massive. However, no visual difference will be observed due to the newly developing outer layer obscuring the rapidly warming oilsphere.

Main Sequence
 Massive Stars  Shortly after the Renosphere gets established, the most massive stars will continue to shrink and become denser until it reaches 500c, by this stage it will ignite form the inside out. During this stage, the star will also shrink so the density of the star will also match the density of it's core. Peak temperatures can reach up to 5000c which makes the most massive stars type K-G. However due to the extreme gravitational pull of these stars, all of the oil will be consumed within just a year, this means that the star will undergo extreme temperature unbalancing and rapid changes in brightness. This burning of the fuel will generate a enormous amount of carbon dioxide, which the oil star will feed on for the rest of it's life before it completely vanishes. This entire process will take 4-6 years and during this, the star will slowly dim as the remaining fuel dissipates.

 Average Stars 

Once the Renosphere is established, Average stars with a mass of 0.8-2x the masses of NY-Beta will slowly heat up and eventually, the core's heat will eventually violently explode due to the energy buildup and ignite. Due to the gravity of these average stars being roughly 4.5-8.1x less than the massive stars, these stars burn through the fuel much slower and it's oil will last roughly 10-30 years. It's size will also shrink significantly slower and fluctuation in the brightness and heat are rare due to the stabilizing in the core's magnetic field. Once the star exhausts' its oil supply, it will use carbon which it will subside on for another 5-7 years before rapidly dimming and dissipating.

 Least Massive Stars 

However, after the Renosphere merges with the oilsphere layer, there won't be enough heat buildup to ignite these types of stars. There have been only 5 cases where a star with a mass of 0.01 of the mass of NY-Beta have ignited and this is mostly due to a oil planet colliding with it or a gamma ray burst was aimed at it. In both instances these stars ignite very differently form the others since they actually ignite form the outermost layer then slowly creep inwards towards the core. This process actually takes a lot longer than even the average stars as this takes roughly 50-120 years to be completed. which shortly after, it's extremely low gravity will take it another 20 years to burn the remaining carbon dioxide. during this stage however, it's size is no different than the carbon stars that are in the average stars and massive stars. Shortly after it runs out of fuel, it will quickly die out leaving zero traces of it behind.

 Oil giants 

Oil giants are a class of brown dwarfs that although have the pressure and mass to heat up significant amounts of oil (67c), it doesn't have the pressure to ignite it even when it's heated up via collisions or even a nearby supernova. Instead, these oil giants will slowly convert the oil into carbon then consume the carbon. These stars last for roughly 200-1,800 years depending on their mass. However, unlike other stars, they do leave remnants. The remains of these stars consist of gaseous carbon, methane and a small amount of hydrogen that haven't been consumed when the oil giant still had the gravitational pull to convert them into energy.

Potential Gamma ray bursts
It has been noted that the most massive oil stars will collapse on itself when it runs out of fuel and then during this stage while it converts into a carbon star, it will eject radiation through it's poles. Although there is some evidence form Masue-18 that it does release a small amount of gamma radiation, it is is minor that it won't even effect a planet that is 10 AU away form it.