The 2003 Chevrolet Express comes in a whopping ten variants across three different model lines: the 1500, the 2500, and the 3500. The engine oil type and capacity will vary among these different configurations. For the 1500, the 4.3L V6 engine takeS4.5 quarts of SAE 5W-30 full synthetic motor oil. The 5.3L V8 takeS6.0 quarts of the same. In emergencies, You can substitute SAE 5W-40 over short periods. For the 2500, the 4.3L V6 engine takeS4.5 quarts of SAE 5W-30 full synthetic, while all other variants (the 4.8L V8, the 5.3L V8, and both 6.0L V8 variants) take 6.0 quarts of the same. The same substitution principle as above applies. For the 3500, all engine configurations (the 4.8L V8 and two 6.0L V8 variants) require 6.0 quarts of SAE 5W-30 full synthetic motor oil. The same substitution as above applies here as well.
John A.
January 2, 2020
The 2003 Chevrolet Express Van comes in one of three configuration 1500, 2500, or 3500. Each of these has its own selection of engines. Chevrolet Express 1500- the 4.3L V6 (base) engine needs 4.5 quarts of 5W30 synthetic oil while the 5.3L V8 (optional) engine needs 6 quarts of 5W30 synthetic oil. Chevrolet Express 2500- the 4.3L V6 (base) engine uses 4.5 quarts of 5W30 synthetic oil. The 4.8L V8 (optional) engine uses 6 quarts of 5W30 synthetic oil. The 5.3L V8 (optional) engine uses 6 quarts of 5W30 synthetic oil. Both of the 6.0L V8 (optional) engines (engine codes [U] 9 and [U] U) uses 6 quarts of 5W30 synthetic oil. Chevrolet Express 3500- the 4.8L V8 (base) engine requires 6 quarts of 5W30 synthetic oil while both of the 6.0L V8 (optional) engines (engine codes [U] 9 or [U] U) requires 6 quarts of 5W30 synthetic oil.
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