To investigate the effect of recycled engine oil bottoms (REOB) as a compatibilizer on properties styrene–butadiene–styrene-modified bitumen (SBS-PMB), this paper studied preparation method, properties, and micro-mechanism composite modification matrix with SBS REOB. Firstly, multi-factor orthogonal experiment determined optimal scheme REOB/SBS composite-modified (REOB/SBS-PMB). Then, high-temp...