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At what point should I be concerned with burning a little oil at start up? How much is considered too much oil to add between changes?

I've been running Mobil 1 Syn High Mileage 5w-30 for about a 1.5 months now and I'm noticing quite a bit of blueish smoke when I first crank my truck. I'm assuming that since this is a thinner oil than what I was using and seals having some wear on them is the reason... Should I be concerned at...

I think it's settled, I'm swapping to Mobil 1 Syn High Mileage 5w-20. Is there a best practice for swapping from Conventional to Synthetic? Does it matter? I'll be draining Mobil 1 Super 5000 conventional and replacing with synthetic, any problems with new syn oil mixing with the old conv oil...

This will sound stupid but I always like the coarse end of the fram oil filter. Makes it possible for me to change it with only grip strength, no tool needed. Dumb, I know. I'll change to motorcraft. As for seafoam, I saw first hand what it can do when used as a fuel additive. I'm not saying...

Thanks for the suggestion so promptly... Just out of curiosity, why? I understand the oil recommendation but why motorcraft over fram filter and why no seafoam in crankcase? Would anything be good in the crankcase to remove unwanted materials not disposed of by just pulling the drain plug?

I'd like some recommendations on what oil I should use and any additives for 2 vehicles. I've been using the same products for both vehicles for years. Mobil 1 Super 5000 10w - 30, Engine Restore, Fram Oil filter, recently added a little seafoam before last oil change. Thanks. Vehicle #1 : 2002...