Hey guys, I've got an '04 Chevy Colorado 4x4 with the 3.5L Inline 5-cylinder engine. It's going to turn 180k here in the next couple months so I'm trying to come up with a plan of attack for service. I've got a couple questions:
1) Do coil packs need to be replaced at a certain interval or do you just replace them as they die? I had to replace one last summer when it went out so I thought that maybe I should just replace the rest of them with this next round of service. I'll be replacing spark plugs so I'll already be removing them anyway.
2) At 120k miles (May of 2012) I replaced the factory 4x4 fluids with Mobil1 75w90 (diffs) and Redline MTL (xfer case). These fluids therefore have seen 60k miles and nearly 5 years of service on them. Should I go ahead and dump/re-fill these fluids or go farther and if so, how much farther would you recommend? My commute is mostly highway type driving, about 12k per year at this point. I'm not interested in UOA's on these fluids, fyi. If I dump/refill them, I'll stick with the respective fluids unless there's something better I should use.
Any help would be greatly appreciated.
1) Do coil packs need to be replaced at a certain interval or do you just replace them as they die? I had to replace one last summer when it went out so I thought that maybe I should just replace the rest of them with this next round of service. I'll be replacing spark plugs so I'll already be removing them anyway.
2) At 120k miles (May of 2012) I replaced the factory 4x4 fluids with Mobil1 75w90 (diffs) and Redline MTL (xfer case). These fluids therefore have seen 60k miles and nearly 5 years of service on them. Should I go ahead and dump/re-fill these fluids or go farther and if so, how much farther would you recommend? My commute is mostly highway type driving, about 12k per year at this point. I'm not interested in UOA's on these fluids, fyi. If I dump/refill them, I'll stick with the respective fluids unless there's something better I should use.
Any help would be greatly appreciated.