Re: Oil pressure lag
Fram is the only filter manufacturer that I know of that has had problems with drain backs on their filters. They've since improved quality but the mark still remains....
Diesels will always have a rough sound for a minute or so upon start up. Even for gas engines there is a lag in building oil pressure. The more miles, the longer it can take. If anything you can replace the oil pressure sensor, but I doubt you'll notice a difference.
Newer vehicles tend to have NO oil pressure gauge because it confuses some people that they have a problem, as the gauge reads 3/4 pressure until you drive it some then it should settle down to about 1/2 or around there at idle speed once the engine has a few miles on it and the oil thins out. If the oil is old it might show a consistent 3/4 on the gauge even at idle.
I wouldn't worry about it, but what would concern me is having no oil in the filter upon start up.
'11 Ram Quad Cab 4x4 SXT 5.7L HEMI (stock); 48,500m
'06 Pontiac G6 GT 3.5L 220hp; 64,000m
'12 Chrysler 200 Limited 3.6L 283hp; 28,000m
'99 Taurus 3.0L 2V Vulcan 145hp; 154,300m - Traded
Amsoil in all vehicles!