The 2015 Silverado uses either a 6‑cylinder or an 8‑cylinder engine, depending on the trim and option package. Specifically, it can be equipped with a 6‑cylinder 4.3L V6 or one of two 8‑cylinder V8s (5.3L or 6.2L).
In more detail, Chevrolet offered three gasoline-powered powertrains in the 2015 Silverado: a 4.3-liter V6 and two V8s. A diesel option was not offered for the 1500 model that year, and the 3.0‑liter Duramax inline‑six did not arrive until later model years (introduced around 2017 for the Silverado 1500).
Engine options in 2015 Silverado
The following list summarizes the gasoline engines available in the 2015 Silverado and their cylinder counts.
- 4.3L V6 — 6 cylinders
- 5.3L V8 — 8 cylinders
- 6.2L V8 — 8 cylinders
In short, buyers could choose between a 6‑cylinder base engine and two 8‑cylinder options, depending on configuration and trim.
Cylinder numbering on these engines
All three engines use a standard GM cylinder numbering scheme, with numbered cylinders from 1 up to the total count for the engine. For the 4.3L V6, that means cylinders 1–6; for the 5.3L and 6.2L V8, cylinders 1–8. The exact physical arrangement (which bank each number appears on and its front-to-back orientation) varies by engine family, and detailed mappings are found in the respective service manuals.
Note on engine lineup and availability
A diesel option (Duramax) was not part of the 2015 Silverado 1500 lineup. The 3.0L Duramax inline-six diesel appeared later, in 2017 model years, expanding the engine choices beyond the 4.3L V6 and the two V8s.
Summary
For the 2015 Silverado, cylinder counts were 6 or 8 depending on the engine: 6 cylinders for the 4.3L V6, and 8 cylinders for the 5.3L V8 and 6.2L V8. The cylinder numbers run from 1 to the total cylinder count (1–6 for the V6, 1–8 for the V8), with the exact bank/position mapping available in GM’s service documentation. The Duramax diesel did not appear in the 2015 lineup but was introduced later.