I'm having oil pressure concerns as the guage reads normal sometimes and 40 or below at other times. I'm thinking the oil pressure relief valve may be sticking but haven't checked the pressure with a manual guage as yet. I'm not sure where to locate all those items. The problem seems to be inconsistant. I'm wondering if anyone has any advice? Are these normal for a 3800 with 136K on it? Most are freeway miles and no hard driving or towing. Loved to hear your suggestions.

Split/moved/Bump to mechanical section.