Hi! New to this forum and have a quick question. looking at buying an 09 crew cab chevy 2500HD 6.0 ohv VVT Vortec. test drove it tonight and really like it but noticed when idling it only has about 25 lbs. of oil pressure and when on the highway, at about 1800 rpm's (55 mph) it only has a little better then 40 lbs. truck has 83,000 miles on it and seems to be well maintained. does this seem to be the norm? are there any other issues i may want to be aware of with this powertrain and truck? thank you in advance for any help you may be able to provide.