I have a 2007 Avalanche LT with 5.3 engine, book says 6 qts but that puts the level about 1/2 inch above the hash marks on dip stick. If left there the oil pressure is very erratic at interstate speed, if I drain about 1/2 qt out pressure will be steady at 40 psig. Anyone else have this problem ? Thanks in advance.
Wwheeler
Wwheeler