diff --git a/src/main/java/com/goi/erp/client/SamsaraStatOdometerClient.java b/src/main/java/com/goi/erp/client/SamsaraStatOdometerClient.java
index b3f1630..e575148 100644
--- a/src/main/java/com/goi/erp/client/SamsaraStatOdometerClient.java
+++ b/src/main/java/com/goi/erp/client/SamsaraStatOdometerClient.java
@@ -2,57 +2,117 @@ package com.goi.erp.client;
 
 import com.goi.erp.dto.ScheduleWorkerRequestDto;
 import com.goi.erp.dto.ext.ExtSamsaraOdometerFetchCommand;
-
+import com.goi.erp.dto.ext.ExtSamsaraOdometerRecordDto;
 import lombok.extern.slf4j.Slf4j;
-
 import org.springframework.beans.factory.annotation.Value;
 import org.springframework.stereotype.Service;
 import org.springframework.web.reactive.function.client.WebClient;
 
+import java.time.LocalDateTime;
+import java.util.ArrayList;
+import java.util.List;
+
 @Slf4j
 @Service
 public class SamsaraStatOdometerClient {
 
-	private final WebClient webClient;
+    /** WebClient in-memory 버퍼 한계 (기본 256KB → 16MB로 상향) */
+    private static final int MAX_IN_MEMORY_SIZE = 16 * 1024 * 1024; // 16MB
+
+    private final WebClient webClient;
+
+    /** 한 번 호출 시 보낼 externalId 최대 개수 (기본 100) */
+    private final int chunkSize;
 
     public SamsaraStatOdometerClient(
             WebClient.Builder webClientBuilder,
-            @Value("${integration.api.base-url}") String integrationBaseUrl
+            @Value("${integration.api.base-url}") String integrationBaseUrl,
+            @Value("${integration.api.odometer.chunk-size:100}") int chunkSize
     ) {
         this.webClient = webClientBuilder
                 .baseUrl(integrationBaseUrl)
+                // DataBufferLimitException(262144) 방지
+                .codecs(configurer ->
+                        configurer.defaultCodecs().maxInMemorySize(MAX_IN_MEMORY_SIZE))
                 .build();
+        this.chunkSize = chunkSize;
     }
 
     /**
      * integration-service 호출
-     * POST /vehicle/odometer/fetch
+     * POST /vehicle/stat/odometer/fetch
+     *
+     * externalIds 가 chunkSize 를 넘으면 나눠서 호출하고 records 를 병합한다.
      */
     public ExtSamsaraOdometerFetchCommand fetchOdometer(
             ScheduleWorkerRequestDto request
     ) {
+        List<String> externalIds = request.getVehicleExternalIds();
 
-    	try {
-            return webClient.post()
+        // externalIds 가 없거나 chunkSize 이하이면 단건 호출
+        if (externalIds == null || externalIds.size() <= chunkSize) {
+            return callOnce(request);
+        }
+
+        // chunk 단위로 나눠서 호출 → records 병합
+        final List<String> originalIds = externalIds;
+        List<ExtSamsaraOdometerRecordDto> mergedRecords = new ArrayList<>();
+        String source = null;
+        LocalDateTime fetchedAt = null;
+
+        try {
+            for (int i = 0; i < originalIds.size(); i += chunkSize) {
+                List<String> chunk = originalIds.subList(
+                        i, Math.min(i + chunkSize, originalIds.size()));
+
+                // 호출자 객체에 청크 세팅 (마지막에 원복)
+                request.setVehicleExternalIds(chunk);
+
+                ExtSamsaraOdometerFetchCommand part = callOnce(request);
+                if (part == null || part.getRecords() == null) {
+                    continue;
+                }
+
+                // source / fetchedAt 은 첫 응답 기준으로 유지
+                if (source == null) {
+                    source = part.getSource();
+                    fetchedAt = part.getFetchedAt();
+                }
+                mergedRecords.addAll(part.getRecords());
+            }
+        } finally {
+            // 호출자 request 객체 원복 (부수효과 방지)
+            request.setVehicleExternalIds(originalIds);
+        }
+
+        log.info("[ODOMETER_RAW][CHUNK] totalExternalIds={} chunkSize={} mergedRecords={}",
+                originalIds.size(), chunkSize, mergedRecords.size());
+
+        return ExtSamsaraOdometerFetchCommand.builder()
+                .source(source)
+                .fetchedAt(fetchedAt)
+                .records(mergedRecords)
+                .build();
+    }
+
+    /**
+     * 실제 단건 호출. 현재 request 에 세팅된 externalIds 로 그대로 호출한다.
+     */
+    private ExtSamsaraOdometerFetchCommand callOnce(
+            ScheduleWorkerRequestDto request
+    ) {
+        return webClient.post()
                 .uri("/vehicle/stat/odometer/fetch")
                 .bodyValue(request)
                 .retrieve()
                 .onStatus(
-                    status -> status.is4xxClientError() || status.is5xxServerError(),
-                    resp -> resp.bodyToMono(String.class)
-                        .map(body ->
-                            new RuntimeException(
-                                "INTEGRATION_ERROR: " + body
-                            )
-                        )
+                        status -> status.is4xxClientError() || status.is5xxServerError(),
+                        resp -> resp.bodyToMono(String.class)
+                                .map(body ->
+                                        new RuntimeException("INTEGRATION_ERROR: " + body)
+                                )
                 )
                 .bodyToMono(ExtSamsaraOdometerFetchCommand.class)
                 .block();
-
-        } catch (Exception e) {
-            // 이 메시지가 OPR 서비스 레벨까지 올라감
-            throw e;
-        }
     }
-}
-
+}
\ No newline at end of file