I NA heter den "The Magnusson act", kan läsas via länk nedan.
http://www.gopurepower.com/site/infolibrary/magnuson-moss-act.asp
Amsoil, ett mindre

oljebolag i NA har också bråkat med BRP runt 2010och utfallet var detta (långt var det också)
Amsoil sued ski doo using this law and won. Ski doo agreed to change the language in thier owners manuals. see below:
OBJECTIVE:
1. Communicate a significant language change in BRP’s warranty
policy.
2. Communicate that the use of AMSOIL lubricants in BRP
snowmobile and ATV engines will not place warranties at risk.
3. Assure customers that AMSOIL synthetic lubricants meet or
exceed the performance requirements of BRP snowmobile and
ATV engines.
TECHNICAL DISCUSSION:
AMSOIL customers who recently purchased a Ski-Doo snowmobile
or Can-Am ATV were advised that it was necessary to
use BRP-branded lubricants or risk the loss of warranty coverage.
Customers were referring to language found in multiple
Ski-Doo and Can-Am operator’s guides that instructed use
of only a specified BRP synthetic lubricant. Further, the
guides state “Use of other engine oils may cause severe engine
damage and may void the limited warranty” (3)(4). Additional
BRP operator’s guides state there is “no known equivalent”
(1)(4) to the branded BRP lubricant on the market.
AMSOIL confronted BRP about the warranty language in its
operator’s guides. Specifically, AMSOIL asserted that the
warranty language violated the Magnuson Moss Warranty Act,
a federal law which prohibits manufacturers from requiring
the use of a branded service/replacement part unless the branded
service/replacement part is provided free of charge.
AMSOIL emphasized that its synthetic lubricants meet or
exceed the engine performance requirements for both two- and
four-cycle engines used in power sports equipment.
BRP, while denying that its warranty language violated the
Magnuson Moss Warranty Act or any other regulation, advised
AMSOIL that it has never denied a warranty claim based on
the use of “improper oil” (2). Furthermore, BRP advised that
it will modify the language of its operator’s guides as follows:
1. It will no longer say that use of oil other than the BRPbranded
product may void the warranty.
2. When it recommends a particular branded product, it will
ensure that the language is clearly identified as a recommendation
rather than a requirement.
3. It will no longer comment on the availability of equivalents
to the BRP brand oil(s).
AMSOIL is publishing this notice to inform the public of this
significant change in BRP’s warranty policy, assure customers
that AMSOIL synthetic lubricants meet or exceed the performance
requirements of BRP engines and ensure that snowmobile
and ATV owners do not mistakenly believe that use of
AMSOIL lubricants will place their warranties at risk.
RECOMMENDATION
For performance specifications and applications, refer to the
product label or data sheet, AMSOIL Powersports Application
Guide (G2135) or the Powersports Online Lookup. The AMSOIL Technical Services
Department can be reached at 715-399-8324 for oil recommendations
regarding Ski-Doo or Can-Am applications.
REFERENCES
1. Can-Am
™|BRP. 2009 Operator’s Guide DS450™ EFI
DS405™ EFI X™ XC. 219 000 576, Canada: Bombardier
Recreational Products Inc., 2009. 84. Print
2. Morisset, Paule. Letter to Mr. Michael W. Haag of Foley &
Mansfield PLLP, Attorneys at Law; Minneapolis, MN. June
23, 2009.
3. Ski-Doo®|BRP. 2009 Operator’s Guide REV-XP. 520 000
900, Canada: Bombardier Recreational Products Inc., 2009.
61. Print.
4. 2008-2009 operator’s guides for BRP snowmobiles (Ski-
Doo) and ATVs (Can-Am) contain this language.