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So should I think Im gonna switch to valvoline nextgen 5w20 for the Galant and 5w30 for the van with napa filters next change

No, no sludge every vehicle has their changes all respectively at there 3~3500 mile marker. No sludge in any of the vehicles. The reason to switch oils or see if there is a need to, is because I'm confirming that what I'm doing is in the engines best interest.

Thank you. I am curious though if once the oil 'slips' by the seals while using a syn after it is done pushing out sludge will it seal back up? Also I was curious how would Valvolines newest creation NextGen hold up on Vehicles 1 and 4 with a 5w20? ^^ The HD Truck listed in #3 is a gasoline...

Hello all, So I have 4 vehicles which I have been using just regular 5qt jug of castrol 5w30 and a fram tough guard filer. The silverado uses a ACDelco filter. All of them are dd's or get driven at least once a day. Car 1 is a 2003 Galant 2.4 4 banger with a little over 100k on it.. It gets...