Plus 1.5 Oil Pan


Keep your 2009-Later Touring Model cool.  Todays Big Twin engine makes a lot more power and a lot more heat than its predecessor of 20 years ago. In 1993, the 80 CI Evo engine made 69 ft-lbs torque, according to online specs. In 2009, the 110 CVO engine made a claimed 115 ft-lbs torque. More torque equals more heat, but that’s just part of the story. The engine oil capacity of 4.0 quarts is unchanged from 1993 to present even though modern engines make a lot more power and a lot more heat. To the engineers at BAKER Drivetrain, this didn’t make much sense. Engine oil does two things. It lubricates metal-on-metal interfaces and carries heat away from hot spots like cylinder heads and the underside of the pistons. So BAKER’s +1.5 quart oil pan was designed to lower engine oil temperature by using a larger volume of oil to carry heat away from the hot engine.

– Reduces the engine oil temperature by 16 degrees or more
– 2-piece 6061-T6 aluminum construction with metal core gasket
– Features cooling fins on bottom with highlighted finish
– Co-planar baffle labyrinth design to channel oil through the pan
– Clearanced in the rear for crossover exhaust pipe compatibility
– Zero leak drain plugs for engine and transmission oil
– Easy installation about 2 hours and no modification required
– Works with aftermarket and OEM oil temperature sending units
– 5 Year Limited Warranty

Kit Contents

Finish Options
The 1.5 has 3 finish options, gloss black, standard wrinkle black or granite for CVO models.


Gloss Black Finish


Wrinkle Black Finish


CVO Granite Finish


Anatomy Of A BAKER 1.5 Oil Pan
The 2-piece pan design features a co-planar labyrinth to circulate hot oil from front to rear on the top level, and rear-to-front on the bottom level. The 2-piece construction was necessary because the bottom half being much wider than the gasket profile of the transmission case.

Internal View

Internal Fluid Flow


Dynamic Road Test Temperature Readings

Oil Temperature Readings
Looking at the images on the right, the +1.5 oil pan was good for an average 16 reduction in engine oil temperature and a 20° reduction in stop and go traffic in sub-90° ambient Michigan temperatures. Note the engine oil temperature went up to 315° in the stop and go traffic segment with the stock pan. It is very bad for engine oil to go above 300°. Higher reductions in engine oil temperature with the +1.5 oil pan can be achieved in warmer ambient climates in the south.


1/2 Hour Static Temperature Test

Most late model 2011 Big Twins, including our 2011 Road Glide, come with an oil cooler. The Factory oil cooler works very well when going down the road at highway speeds with air flow going over the heat exchanger but is marginally effective in stop and go traffic. The +1.5 oil pan is effective in reducing engine temperature on the highway or in traffic because it works through additional oil capacity, not a heat exchanger. To test this we did an static temperature test for a half hour on each pan while checking the temperature at 10 minute intervals . The +1.5  shows over a 9° difference compared to stock just at a stand still.


Pan Comparison
The +1.5 pan oil capacity, up to the gasket surface, is 4.1 quarts. The stock pan oil capacity, up to the gasket surface, is 2.6 quarts. The side-by-side bottom view shows the comparative size difference. The +1.5 is 8.053″ wide, which is about 2 3/8″ wider than stock. To aid in cooling the +1.5 has cooling fins in the front and rear giving more surface area.  The installed pan comparison image really shows how the +1.5 completely fills the under carriage of the frame; looking like it was supposed to be that way from the factory.

Side-By-Side Pan Comparison

Installed Pan Comparison


To realize maximum engine cooling benefit
Install the +1.5 pan and fill the oil sump to 5.5 quarts (+1.5 quarts) to realize the maximum reduction in oil temperature. Oil fill level on the dipstick will read the same as stock.


To realize maximum oil blow-by reduction
Oil blow-by on SE 110 engines is a chronic issue for aggressive riders. It is caused by the larger displacement engine building up pressure in the cam chest and the oil sump. This forces oil up the push rod tubes, out the head breathers, into the air cleaner and all over the right side of the bike. Harley tech line is advising dealers to run the stock oil sump 1 quart low to increase the volume of air in the sump. This corrects the blow-by issue but makes the oil temperature skyrocket. By running the +1.5 pan at .5 quarts over stock (4.5 quarts) the blow-by condition can be cured with a small improvement in oil temperature reduction.


Diamond Cut Option
Cool your oil 12% faster by diamond cutting your +1.5 oil pan. We worked with Keith Brinton owner of “Diamond Heads” to increase cooling and give the customer a little personalized appearance to our pan. The look is created by making hundreds of cuts in the outer edge of the cooling fins these cuts do two things they make the pan look fantastic because the cuts are placed at the perfect angle to reflect light. It is that reflection of light that makes them sparkle and shine. Secondly they help the engine run cooler, the added surface area to the cooling fins by all the hundreds of cuts, but more importantly those cuts create turbulence as you ride that turbulence forces more air in on the cooling fins.

Diamond Cut Fins Only, PN BD-1.5B-DCF

Diamond Cut, Show Cut, PN BD-1.5B-DCS


For more information on Diamond Heads: Click Here


The +1.5 will fit 2009-Later Touring Models.


PN Description
BD-1.5B-B 1.5 Hog Black Pan, Highlighted
BD-1.5B-CVO 1.5 Granite Coated Pan, Highlighted
BD-1.5P 1.5 Show Polished Pan -Special Order Only-
BD-1.5B-C 1.5 Chrome Pan -Special Order Only-
BD-1.5BB-DCF 1.5 Hog Black Pan, Diamond Cut Fins Only
BD-1.5CVO-DCF 1.5 Granite Coated Pan, Diamond Cut Fins Only
BD-1.5B-DCS 1.5 Hog Black Pan, Diamond Cut Show Finish
BD-1.5CVO-DCS 1.5 Granite Coated Pan, Diamond Cut Show Finish


– Chrome and Polished pans are special order only, additional charges apply
– Additional charges apply to diamond cut pans


Recommended Upgrades
– Cruise Drive Hydraulic Side Cover
– Cruise Drive Pulleys
– Cruise Drive Sprockets
– Cruise Drive Top Cover

– Attitude Chain Adjuster Kit

– Bully Derby Cover

– Bully Primary Cover


Click on any of the images below to learn more

LSD Cruise Drive Hydraulic Side Cover

Cruise Drive Pulleys

Cruise Drive Sprockets

Cruise Drive Top Cover


2007-Later Comp Sprocket

Attitude Chain Adjuster

Bully Derby Cover

Bully Primary Cover


Oil Capacity
Total oil capacity (system capacity) Dry: 5.5 quarts
Total oil capacity (system capacity) Wet: 5.0 quarts


+1.5 Article
Read about the +1.5 in Iron Works: Click Here


Installation Instructions
BAKER +1.5 installation instructions with exploded views: Click Here


***Installation Note***
The BAKER 1.5 Pan will not fit properly if the crossmember on the frame is bent. Please make sure that the crossmember between the frame rails is flat and not bent up toward the transmission. A bent crossmember will cause the frame rails to pull toward each other causing the pan to hit the frame on the right side.


Back to the Top


BD-1.5B, Black Highlighted Oil Pan

BD-1.5CVO, Granite Highlighted Oil Pan



Black +1.5 Installed on 2011 Road Glide

Black +1.5 Installed on 2011 Road Glide



BAKER DRIVETRAIN| 9804 E. SAGINAW, HASLETT, MI, 48840 |1-877-640-2004| 517-339-3835 | FAX: 517-339-4590 @2012 BAKER INC