Bowling oil patterns are the layout of lane conditioner that a machine applies before play, and most run between 32 and 53 feet down a 60-foot lane. Short patterns are 35 feet or less, medium patterns 36 to 42 feet and long patterns 43 feet or more, while a typical house shot is 38 to 42 feet.
Length tells you where your ball will start to hook. The shape of the oil across the lane tells you how forgiving it will be when you miss your target.
That second part is what separates a friendly house shot from a tough sport pattern. A house shot puts much more oil in the middle than on the outside, so it steers missed shots back toward the pocket. A sport pattern spreads the oil far more evenly, and the lane stops helping you. Once you know both numbers, you can predict how a lane will play before you throw a ball.
What Are Bowling Oil Patterns?
An oil pattern is the exact amount and placement of conditioner on a lane, from the foul line to the end of the oil. The lane is 60 feet from the foul line to the head pin and 39 boards wide, and the last part of the lane is left dry so the ball can hook into the pins.
Oil does two jobs: it protects the lane surface, and it controls ball reaction. Where there is oil, the ball skids; where the oil ends, it grips and turns. Modern lane machines from makers such as Kegel and Brunswick clean the old oil off and lay the new pattern in the same pass, board by board and foot by foot, following a program the center or tournament chooses.
Because the machine follows a program, the same pattern can be laid on every lane in a center and on lanes in different countries. That is how the PBA and national federations can publish a pattern before an event and every bowler knows what to expect.
The first thing I do in a new center is ask what pattern is out, or at least how long it is. It saves me a game of guessing with the wrong ball.
How Long Are Bowling Oil Patterns?
Most bowling oil patterns are between 32 and 53 feet long, and they are grouped into three bands: short (35 feet or less), medium (36 to 42 feet) and long (43 feet or more). According to Wikipedia's sport bowling entry, a typical house pattern is 38 to 42 feet and USBC sport patterns range from 32 to 53 feet.
Bowling oil pattern lengths at a glance
The lane is 60 feet from the foul line to the head pin.
- Short patterns hook early because the ball reaches dry lane sooner. You usually play closer to the outside boards and need control more than power. Our guide on how to bowl on dry lanes covers this in detail.
- Medium patterns give you the most freedom to choose a line. See how to play on medium oil patterns.
- Long patterns make the ball skid further, so most bowlers move deeper inside and use a stronger ball. Our guide to bowling on long oil patterns explains the adjustments.
What Is the Difference Between a House Shot and a Sport Pattern?
The difference is the oil ratio: how much more oil sits in the middle of the lane than on the outside. The USBC defines a sport condition as a ratio of 3:1 or less, and house shots are almost always higher than that.
On a house shot, a ball missed to the outside finds dry boards and hooks back, while a ball missed inside hits more oil and holds its line. That built-in correction is why scores are higher in open play and most weekly leagues. On a sport pattern there is far less difference between the middle and the outside, so the same misses are punished.
House shot vs sport pattern
For many years the only US rule for lane oil was the American Bowling Congress three-unit rule from 1992, which required a minimum of three units of oil across the lane at any distance. The USBC suspended it from August 1, 2019, saying modern equipment had made it no longer applicable, according to its official announcement.
The first time I bowled on a sport pattern, my house-shot line went straight through the nose all night. The fix was to stop trusting the outside boards and hit my target more precisely.
What Are the PBA Animal Patterns?
The PBA animal patterns are a set of sport patterns, each named after an animal, that run from about 32 feet (Wolf) to about 50 feet (Badger). The PBA publishes the pattern sheets on its official oil patterns page, and the six best known are below.
PBA animal oil patterns by length
Lengths from the current pattern files on pba.com.
The full set also includes Wolf, Bat, Bear and Dragon, and there are named Legends patterns such as Earl Anthony, Dick Weber and Mark Roth. Published lengths vary slightly between sources because some patterns have been revised over the years: the USBC's PBA Experience pattern list, for example, gives Cheetah as 33 feet and Viper as 36 feet. Centers often run these patterns in PBA Experience leagues, which is the easiest way to try a tour condition yourself.
How Do You Read a Bowling Oil Pattern Sheet?
Start with two numbers: the pattern length in feet and the total oil volume in millilitres. Length tells you where the ball will start to hook; volume tells you how much friction there is overall and how fast the pattern will break down.
After that, a pattern sheet (Kegel's are the most common) shows:
- Ratio: oil in the middle compared with the outside, the house vs sport number above.
- Forward and reverse oil: the machine oils on the way down the lane and on the way back. Reverse oil builds up the front of the lane, which delays hook.
- Load structure: how many passes go on each range of boards, written like "2-2" (board 2 on the left to board 2 on the right) or "10-10". Passes from 2 to 2 cover almost the whole lane, which takes away dry outside boards.
- Graph: a picture of the oil units by board, so you can see whether the oil is flat or shaped like a crown in the middle.
Coach Panagiotis Vardakis goes deeper into using a sheet to plan your line in his guide on how to read oil patterns and build a smart line play.
How Does the Rule of 31 Work?
The Rule of 31 says that pattern length in feet minus 31 gives you roughly the board where your ball should exit the oil and head for the breakpoint. On a 42-foot pattern, that is board 11; on a 38-foot pattern, board 7; on a 35-foot pattern, board 4.
- It is a starting point, not a target to hit at all costs. Ball speed, rev rate and surface all move the real exit point.
- It works best on medium patterns. On very short and very long patterns, treat it as a rough guide.
- Higher-rev players often play a little deeper than the formula says; lower-rev and straighter players often a little further outside.
Our full explainer on the Rule of 31 has more worked examples.
Which Bowling Ball Works on Each Oil Pattern?
As a rule, the more oil and the longer the pattern, the stronger and duller the ball you need; the shorter and drier the pattern, the weaker and shinier. Cover type and surface matter most, with the core and layout fine-tuning how the ball changes direction.
The ball I take out first on a fresh pattern is the one I trust most on medium oil. I only switch once I have seen what the lane is doing for a few frames.
Matching your bowling ball to the oil pattern
General guidance; surface and layout change a ball's reaction as much as its cover.
Two specs help you read a ball before you throw it: RG, which affects how early it revs up, explained in what RG means in bowling, and your own rev rate, covered in our guide to bowling rev rate. For the full picture, see how to choose the right bowling ball for you. Keep in mind that a ball's surface changes as it soaks up oil over many games, which is one reason a bowling ball loses its hook over time.
How Do Oil Patterns Change During a Game?
Oil patterns start changing with the first shot. Balls push oil down the lane into the dry area (carrydown) and wear it away in the part of the lane most people play (breakdown), so the lane you finish on is not the lane you started on.
Read the ball, not the scoreboard, and adjust in small steps:
- Ball hooks early or crosses over the head pin: the front has dried out. Move your feet and target left together (right-handers), or switch to a weaker or more polished ball.
- Ball skids through the breakpoint and hits light: carrydown has pushed oil long. Move toward the pocket side, or use a ball with more surface.
- Ball looks fine but pins carry badly: the ball may be using up its energy too early. Try a smoother ball or a little more speed.
My routine is to make a two-and-one move (two boards with my feet, one with my target) and give it at least a full frame before deciding it did not work. Changing three things at once tells you nothing.
If your ball is simply not turning, our guide on why your bowling ball is not hooking walks through the causes one by one, and if the 10 pin keeps standing, see why you keep leaving the 10 pin.
FAQ
How long is a typical house oil pattern?
Usually 38 to 42 feet, with much more oil in the middle of the lane than on the outside. That shape gives bowlers extra room for missed shots.
What does a 3:1 oil ratio mean?
It means the middle of the lane has three times as much oil as the outside. The USBC treats 3:1 or less as a sport condition; house shots are higher.
Why do bowling alleys oil the lanes?
To protect the lane surface from thousands of balls and to control ball reaction. Without oil, a ball would hook almost immediately and the lane would wear quickly.
What is the hardest PBA oil pattern?
There is no single answer, because difficulty depends on your style. Very short patterns like Cheetah punish power players who hook early, while long patterns like Shark and Badger punish players who cannot get the ball through the oil.
Can you see the oil on a bowling lane?
Not easily. Some bowlers look for the shine under the lights or the oil line on their ball after a shot, which shows where the ball left the oil.
How often do bowling centers oil the lanes?
Most centers clean and oil before league play and often once a day for open play. Tournaments usually re-oil before each squad or block.
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