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Spectro Primary Oil

Picking the right primary fluid ensures the life and durability of your primary, that’s why BAKER recommends a 85W primary oil like the Spectro Heavy Duty Primary Oil. This Spectro SAE 85W viscosity helps eliminate any slipping or clutch drag.

Learn more about Spectro oils here:

  • BAKER Bully Primary
  • BAKER Function Formed Primary
  • BAKER Bully Primary Cover Fluid Capacity Dry: 38-45fl-oz
  • BAKER Function Formed Primary Fluid Capacity Dry: 10-14fl-oz


BAKER Drivetrain reserves the right to change prices, terms or policies at any time without notice. Orders can be pre-paid using Visa, MasterCard, American Express, Discover or PayPal. All orders not pre-paid will be sent C.O.D. certified check or money order only unless pre-approved for company check acceptance. Any orders from outside the USA must be pre-paid in US funds via wire transfer; a $30 transfer fee will apply. Prices shown are F.O.B. Haslett, MI.


BAKER™ transmission assemblies and transmission builder 's kits, are guaranteed to the original purchaser to be free of manufacturing defects in materials and workmanship for a period of 5 years from the date of purchase or up to 50,000 miles, whichever occurs first. All other BAKER products are guaranteed to the original purchaser to be free of manufacturing defects in materials and workmanship for a period of 2 years from the date of purchase or up to 24,000 miles, whichever occurs first, except for the following; Warranty does not cover clutch plate wear, throw out bearing failures or mainshaft breakage due to improper clutch nut installation.Electrical components carry a 30-day warranty; cosmetic finishes (chrome plating, hard anodizing, powder coating) are covered for 60 days. Certain promotional products may carry a shorter warranty as specified at the time of purchase. If the product is found by BAKER to be defective, such products will, at the option of BAKER, be replaced or repaired at cost to BAKER.In the event warranty service is required, the original purchaser must call or write BAKER immediately with a description of the problem. If it is deemed necessary for BAKER to make an evaluation to determine whether the transmission assembly or transmission kit or accessory is defective, the entire transmission assembly, whether originally purchased as an assembly or kit, must be properly packaged and returned prepaid to BAKER with a copy of the original purchase invoice. If after evaluation by BAKER a defect in materials and/or workmanship is found, BAKER will, at their option, repair or replace the defective part of the assembly.


Returns are permitted within 90 days of the delivery date. Any merchandise returned for any reason (exchange, credit or modification) must be accompanied by a Return Goods Authorization (RGA) number or it will be refused. Call BAKER to obtain this number prior to returning goods for any reason. There is a 15% re-stocking fee for all returned items. BAKER is not liable for any shipping.


NOTE: Limited warranty does not cover labor or other costs or expenses incidental to the repair and or replacement of BAKER products.This warranty does not apply if one or more of the following situations is judged by BAKER to be relevant: BAKER OEM transmissions ; (these are subject to the OEM manufacturers warranty only), Improper installation , accident, modification (including but not limited to use of unauthorized parts, transmission oils or lubricants), racing, high performance application, mishandling, misapplication, neglect (including but not limited to improper maintenance), or improper repair.BAKER shall not be liable for any consequential or incidental damages arising out of or in connection with a BAKER transmission assembly, transmission kit, component or part. Consequential damages shall include without limitation, loss of use, income or profit, or losses sustained as the result of injury (including death) to any person or loss of or damage to property.BAKER transmissions, transmission kits and accessories are designed exclusively for use in American V-Twin motorcycles. BAKER shall have no warranty or liability obligation if BAKER parts are used in any other application.If it is determined that a BAKER product has been disassembled during the warranty period for any reason, this limited warranty will no longer apply unless you were instructed to do so by a BAKER Drivetrain technician for diagnostic purposes.

Spectro Primary Oil
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Customer Reviews
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ken p.
United States
  • What model motorcycle do you ride? 2014 FLHX Heavily Modified

Switched From HB125-07 SOHB Hydraulic Tensioner & Bel-Ray Primary Oil

Running Bel-Ray Primary oil w/SOHB hydraulic tensioner…hard shifts! Changed to Spectro with a manual Baker tensioner, huge positive difference. Now shifts smooth & clean. Also run a GrudgeBox N1 configuration, how sweet it is!!

stephe H.
United States United States
  • What model motorcycle do you ride? 2015 street glide special

so farr primary has calmed down, transmission quiet as baker made it so farr

Tommy B.
United States United States
  • What model motorcycle do you ride? 08 rocker

The best

Anyting Baker uses damn I'm going to use it as well good oil can't beat it good product

United States United States
  • What model motorcycle do you ride? Road King, Dyna, Softail, and Shovelhead.


This is the oil most recommended and made in USA. Primary is quiet and happy. A cool feature is that each bottle is individually wrapped in thick plastic. Should a leak happen the whole package wouldn’t be covered. Very cool detail, it is appreciated.

Jeffrey S.
United States United States
  • What model motorcycle do you ride? 09 big dog wolf 04 big dog mastiff

Good stuff!

Definitely buy baker again!

Web Product ID: 9225622862
Baker Drivetrain Team Illustration