Amsoil 10-40 or castrol syn 10-40 in my ford truck (215K original everything until I finish the 331), amsoil 15-40 marine oil in my boats ONLY
Mobil1 GL5 75-90 in my lower units.
wolfshead mercon/dex3 in my auto trannies
M1 5-30 in the 98 olds
m1 5-30 in the 93 escort (1 change a year - grannys car)
walmart 10-30 in my 88 chevy truck (230K - not original) and 85 wagon (182K original motor) 5-30 or 10-30 in the 91 s blazer (185K original motor for 1-2 more weeks as soon as I finish that motor then likely 10-30 syn)
M1 10-30 and 15-50 mix (50/50)in the atvs
Golden spectro 10-40 syn in the V65 ONLY
walmart 30 in the mowers and garden tractor
delo or rotella 15-40 in the diesel tractors
walmart brand meeting UDT and massey MP fluid for the hydraulics
Id hazard those are my 'favorites' as each manu/grade is selected for performance and price (for example, the honda V45/65's REQUIRE that oil to save the cams, nothing else comes close)
I stock walmart brand in 5,10-30 and sometimes 10-40 and wolfshead if I can get it. I prefer not to do oil changes in my shop, but if I do, thats what they get unless they spec syn oil. I rebuild a lot of motors and have had 0 comebacks (proving you can do stuff right, I just dont charge enuf)
Do not like QS and pennzoil syn oils - caused too much valvetrain noise on my ford. wont use mobil delvac - too many horror stories from OTR drivers but I am gonna switch to straight 30 in the massey next change - probly use pennzoil 30HD.
have nothing against the other brands, but they dont offer anything over the wolfs head and walmart brands, and cost more (walmart oil is QS anyways)
I also dont beleive all the amsoil hype. however, 10-40 in that truck (since birth) have kept the valves quiet. now that Im on the twilight of that motor with a firebreathing 331 on the stand (at least I hope it breathes fire - we shall see) Im using the castrol as it gives the next best performance. as for the boat, last time I looked, only unocal made a marine oil similar and who knows where to get it east coast...I change once a year and use a massive gm filter for an 8qt sump...im not switching unless I have good reason too.
and u didnt ask, but for greases I use whatever I can get cheap in 13oz tubes for the tractor zerks and mower decks (1 tube does both tractors once), wolfshead red for auto suspension crap, pennzoil syn marine for all wheel bearings and lubriplate syn in the big tub for when you have to get messy.
wd40, crc 6-66 or 5-56, liquid wench and pb blaster are my sprays
if I need other lubs, I get whomever is decent priced and good quality - usually mobil, pennz or QS