spfish

I would like to weigh in just a little bit. Just for data and documentation. 2008 Suburban LTZ with LC9 engine (5.3 AFM Aluminum block), 88,000 miles now Mobil 1 synthetic oil since very first oil change. Change oil when DIC says to (6000-8000 miles). Paid mechanic (NOT dealer) to do oil changes (only one guy has ever changed the oil until the last one). He NEVER told me that the oil level was low going into a change so I didn't think I had an oil consumption issue. Suddenly at about 72,000 miles the ZERO OIL PRESSURE warning came on and scared me to death. I've been driving for 32 years and I have NEVER EVER had that happen before. Since 72,000, I've been adding a qt of synthetic about every 3-4,000 miles. That, too, has never happened with ANY vehicle I have ever owned. So this really bothered me and I started keeping up with it. I also have the lifter click at start up for about 5-10 seconds. Idles fine, smooth. I get 15 mpg city and 18 highway. Tailpipe has a jet-black dusty ring around it. Sounds to me like if this is an AFM issue, the oil pushing into thsoe cylinders and slowly cooking off on its way out of the vehicle. I NEVER see smoke. Not at startup, idle or run. Someone told me that synthetic won't smoke. Not sure if that is true or not. And since I'm just talking now, I wanted an HD pickup with the diesel to tow my boat. Wife said she didn't want to hear the diesel. Now I'm divorced and wish to heck I hadn't listened to her. I kept the boat. Gave her up. Have read a few places on here, "I love my truck, but I wish it didn't burn oil DITTO! I don't care what ANYONE says, a 2008 model truck that cost $55,000 should NOT burn a qt of oil ever 3,000 miles. If GM says that's normal, then that's part of why GM has been in bad trouble. My 1999 K1500 Suburban ran to 180,000 miles and never used a drop of oil. The tranny gave out after pulling that 6,000 lb boat and trailer. But never used oil. My 1994 C1500 Suburban ran to 150,000 miles and never used a drop of oil. This one disappoints me but my loyalty is to GM so I guess I'm going to stay put.

My 2008 K1500 Suburban lost cruise control about 6 months ago. Thought it would be a dealer issue. Have not been to this site in a while but came here and found a lot of folks have this problem. Common issue is the "stop lamp switch" on the brake pedal. Part number 15861245. $23 from the dealer. Bought it and replaced it myself and that fixed it. Took the old switch apart. Someone here said they fixed the problem by cleaning the contacts. That didn't help me. Inside the switch there is a rotating cam that activates the switch. When pressure is applied to the brake, it rotates. Mine had worn to the point it was not rotating enough to activate the contacts. New switch fixed it. Parts manager said this is a BIG problem and they keep LOTS of those switches on hand. By the way, this DID NOT affect my tail lights or brake lights. The brake lights were working fine. Only affected the operation of my cruise control. GMPartsDirect had it for $10. Easier for me to go 1 mile to the dealer and put it in myself.