# Service bulletin M1631

A bulletin is a manufacturer's communication to its dealers, as NHTSA indexes it. The summary is NHTSA's. The document is the manufacturer's: read it at NHTSA. A bulletin is not a recall, and listing a model year does not mean every vehicle of it is concerned.

- Type: Service bulletin
- NHTSA id: 10251384
- Published by NHTSA: 2024\-03\-06
- Manufacturer's number: M1631
- Manufacturer's date: 2024\-02\-20
- NHTSA component: POWER TRAIN; ENGINE AND ENGINE COOLING

## NHTSA's summary

SERVICE BULLETIN M1631: REVOLUTION MAX OIL CHECK PROCEDURE UPDATE. PURPOSE: To inform dealers of a new procedure for checking oil levels on Revolution® Max powered vehicles. The procedure has been updated to account for potential concerns of a low oil fill condition when set on the side stand. This condition could be caused by having varying degree lean angles of the vehicles in the Revolution® Max family while utilizing the same dipstick. Compounding this is the difference in lean angle of vehicles that come equipped with Adaptive Ride Height \(ARH\) set in the locked position \(high\) and set to drop when coming to a stop \(low\). To remedy this potential concern, the final step in checking the oil level will now be performed with the oil at operating temperature in the upright position for consistency across vehicle family and suspension settings. The side stand markings on the dipstick will only be used for a quick reference. NOTE: Oil levels checked on the side stand may read high after servicing the oil level in the upright position hot. This is a normal condition.

## The document

- [NHTSA's copy of the document (PDF)](https://static.nhtsa.gov/odi/tsbs/2024/MC-10251384-0001.pdf)
- [If that address does not open, try this one](https://static.nhtsa.gov/odi/tsbs/2024/MC-10251384-9999.pdf)

The document is the manufacturer's. This site does not hold it.

## Components

Engine, Transmission and driveline

## Vehicles listed

- 2021 to 2023 HARLEY\-DAVIDSON RA1250
- 2021 to 2024 HARLEY\-DAVIDSON RA1250S
- 2024 HARLEY\-DAVIDSON RA1250SE
- 2021 to 2024 HARLEY\-DAVIDSON RH1250S
- 2022 to 2024 HARLEY\-DAVIDSON RH975
- 2023 to 2024 HARLEY\-DAVIDSON RH975S

JSON: [/v1/bulletins/10251384](/v1/bulletins/10251384)

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