However, mixing with other engine oils should be avoided in order to fully exhaust this product’s benefits. SILKOLENE PRO 4 SAE 5W-40 XP is a 4-stroke motorcycle engine oil based on XP Technology. SILKOLENE PRO 4 SAE 5W-40 XP is based on esters and other synthetic base oils with a highperformance motorcycle-specific additive system.
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