Donaldson P-Series Transmission Filters
The Donaldson P-Series Transmission Filters is an automatic transmission and transfer-case filter line, stocked through the AMSOIL catalog for service on vehicles and equipment that do not use AMSOIL-branded filters. Donaldson P-Series is the brand's heavy-duty fleet line, used on Class 7 and Class 8 trucks, off-road construction and mining equipment, agricultural tractors, generators, and similar professional applications. The line emphasizes long service intervals, robust construction, and validated efficiency under sustained load.
Choose the vehicle or equipment first, then select the matching filter code for the exact year, make, model, and engine. The cross-reference result is what matters at order time.
What the line does
The Donaldson P-Series Transmission Filters line handles removing wear particles, varnish precursors, and casting debris from automatic transmission fluid before they reach valve bodies, solenoids, and clutch packs. Filtration at this point in the system is the deciding factor between long, predictable component life and premature failures driven by contamination that would otherwise reach internal surfaces.
Where the line fits
This line is used on passenger cars, light trucks, SUVs, and heavy-duty pickups using common GM, Ford, Chrysler, ZF, Aisin, and Allison automatic transmissions, plus selected medium-duty truck and equipment transmissions. The exact part number for a particular application is set by the lookup result for the year, make, model, and engine in question. Substituting a same-brand part with different dimensions or media because the part numbers look similar usually does not work; the cross-reference is specific.
How to find the right code
Confirm the right cross-reference for the vehicle or equipment in the AMSOIL filter lookup resources before ordering. The original-equipment filter part number from the owner's manual or the existing service record is also a good starting point and will usually return a clean cross-reference within this brand line.
Service recommendations
Replace the transmission filter at the interval specified for the transmission and the operating conditions, typically with a fluid change. Severe service (towing, plowing, mountain driving, taxi, livery) calls for shorter intervals than the highway-equivalent baseline. Documenting the installed part number and the service date in the maintenance log keeps future cross-references accurate and prevents confusion when similar codes show up under multiple brand lines.
About the AMSOIL alternative line
For applications where AMSOIL publishes a matching in-house filter, the matching transmission filter cross-reference for the gearbox is generally the preferred choice because it is engineered around AMSOIL synthetic lubricants and the extended-drain intervals those lubricants support. The Donaldson P-Series Transmission Filters line is the right choice when the application is outside the AMSOIL filter coverage, when the OEM specifies one of these brands, or when the existing service record already runs this line and the maintenance program is already set up around it.
Order the Donaldson P-Series Transmission Filters
The Donaldson P-Series Transmission Filters line is sold through the AMSOIL catalog with individual cross-reference codes selected at order time. Filters are backed by the brand's standard warranty as supplied through AMSOIL. Confirm the right code for the vehicle or equipment with the AMSOIL filter lookup resources, then order the Donaldson P-Series Transmission Filters.
Frequently asked questions
Why does AMSOIL stock Donaldson P-Series Transmission Filters?
AMSOIL stocks the Donaldson P-Series Transmission Filters line so customers running this brand on a particular vehicle or piece of equipment can order both the lubricants and the filters from the same supplier. For applications where AMSOIL also publishes a matching in-house filter, the AMSOIL line is generally the recommended choice; the Donaldson P-Series Transmission Filters line covers the rest of the catalog where AMSOIL does not publish a matching cross-reference.
How is the right cross-reference number selected?
Match the year, make, model, and engine of the vehicle or equipment to the cross-reference in the AMSOIL lookup, or cross from the existing OEM filter part number. Substituting a same-brand part with similar dimensions but different media or fittings is not a substitute; the published cross-reference is what matches the application.
Will using a Donaldson P-Series Transmission Filters affect a new vehicle warranty?
No. Using a published cross-reference filter that meets the OEM specification does not void a new vehicle or equipment manufacturer warranty. The Magnuson-Moss Warranty Act protects the owner from a warranty denial based solely on aftermarket part choice when the part meets the OE specification.
How often should this filter be replaced?
Replace the transmission filter at the interval specified for the transmission and the operating conditions, typically with a fluid change. Severe service (towing, plowing, mountain driving, taxi, livery) calls for shorter intervals than the highway-equivalent baseline. The actual interval depends on the application and the operating environment; severe-service conditions call for shorter intervals than the published baseline.
Can a Donaldson P-Series Transmission Filters be used with AMSOIL synthetic lubricants?
Yes. The filter line and the AMSOIL synthetic lubricant program are independently engineered and work together without compatibility issues. When AMSOIL publishes a matching in-house filter for the application, that filter is generally the recommended choice for the longest-supported drain interval; otherwise this line is the right cross-reference.
Are these filters covered by warranty?
Yes. The Donaldson P-Series Transmission Filters line carries the brand's standard warranty as supplied through AMSOIL. Defective parts can be returned through the AMSOIL Return Policy when unopened and within the published return window.
