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Sounds like your chain is to tight.Take the cover that is at right side of the saw motor off and loosen the two nuts a bit and look for a tension screw behind the bar and back it off,if the bar won't move loosen the two nuts that hold the bar on the saw.With the saw siting like you use it pull down on chain and get about 1/8 of an inch between the bar and chain.(use gloves)If the bar is blue by the chain groove You will need a new bar.Blue means the bar has over heated and lost its temper.The blue metal is brittle in other words.You should all so check the drive sprocket for wear.
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Remove the cover that cover the rear of the chain bar.Now,loosen the nuts that attach the bar and slide the bar reward.Now set the chain in the slotted part of the bar,pull it forward until there is abut 3/8 of an inch slack in the chain an tighten the nuts.Re-install the cover.
I have a Poulan Pro 295 20". When I bought it I also bought a 16"bar and chain and have been using those since. They make the saw much easier to handle and are a better match to the available power.
The key dimension is from the bar's mounting hole to its end. At the store look at the normal replacement bar for your 18" saw, and pick out a 16" or even 14" bar with the same dimensions there. This can be easily seen by laying one bar over the other.
If you are using winter grade bar oil, then when the temps warm up, you are going to go through a lot more bar oil, because the winter grade is much more loose compared to the summer oil. I would not be to worried about using too much oil, because it just means that it is working and lubricating the saw well. About switching to a larger bar, I would not recommend going to a larger bar than what came with the saw, Unless the manufacture states what size bars can be used for the saw. Going to a 20" or 22" bar could bog down the machine, making cuts slower and not as clean, since the increased length of the bar would be too much for the motor to handle. with the larger bar the chain would be larger as well. So the power needed to move that chain has to be increased as well. So unless the manual says something like, "available bars lengths are..." Then I would just stick with the bar size it came with.
If a new chain ::
make and model is important here, as are guide bar length
a particular chainsaw, may be available with 12,14,16,18,20,22,24,26 inch guide bar,
likewise different saws (even from different makers) use the same size of chain
a chain for this saw may be sold in a variety of lengths or
may be sold in the longest length only and require links removed to suit smaller bars.
back to the store, with the saw, for confirmation
If an old chain::
stretched way beyond safety, replace