Silkolene Pro4 XP Oil - 10W40 - 4L. 600885632 Using electrostatic forces to bond low friction molecules to stressed metal surfaces, Pro 4 releases hidden power and ensures long-term performance retention Exceptional stay-in-grade characteristics makes it ideal for all highly tuned, high output engine transmission units Fully synthetic and race proven to provide exceptional anti-wear and anti-friction performance under all temperature extremes Utilizes ester synthetics, derived from aerospace lubrication technology, to impart excellent anti-wear properties throughout a wide operating temperature range Advanced surface chemistry provides vital protection to pistons and bores, cam lobes and bearings, even during the cold start period before full lubricant flow is achieved