Word-of-mouth (WOM) in marketing-focused literature, provides informal positive or negative communication between customers about brands, products, or services. In the digital era, WOM has evolved into electronic word-of-mouth (eWOM), enabling customers to access information faster and easier. However, there is limited research looking at the eWOM as a moderating variable toward purchase intention in the theory of planned behavior (TPB) model. This research aims to determine whether there is an effect of eWOM as moderating role on customer intentions in the TPB model, to purchase lubricant products at shell petrol station. There are 226 data as basic materials for research, obtained from primary data or quantitative data, using purposive or non-probability sampling techniques, and processed using PLS-SEM version 3.0. The finding shows there are several positive significant results such as the perceived behavioral control variable on purchase intention, subjective norm on purchase intention, and eWOM moderation on subjective nowrm towards purchase intention. This research has added knowledge to the marketing literature. It also gives a strong insight to petrol station owners about customer behavior. Therefore, the owners could make decisions to increase sales and profitability. For future research, there should be more than one shell petrol station, carried out at the level of a wider area (e.g., city or region), or conducting comparative research between different brands.