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Message: <blockquote data-quote="96blak54" data-source="post: 1431432" data-attributes="member: 14727"><p>So im getting ready to do that. My 5.4l 2v npi build this go-a-round got 5w-30 with fairly new PI lashers on the intake valves and 4v lashers on the exhaust. Its got a collapse lasher on the passenger side that clunks at idle and low rpm. Im wondering if I make the switch to 10w-30 their will be a change. I haven't reconnected the oil psi gauge on to the head yet, but before with the last build when it was hooked up, the most oil pressure the head seen was 15psi at 5000rpm. im wondering if psi will raise and also wondering how the lashers will react. Better yet how the whole package will respond.</p></blockquote><p></p>