2000 Intrepid 2.7L engine replaced, problem, questions?
I posted some of these things in another forum and just joined this one, so I would like to know what you guys think. What follows in quotes is only my comments from posts in another forum:
"I started hearing some knocking coming from my engine last week and a buddy of mine at work said it's probably bad gas. So I put some Techron Fuel System Cleaner in it and then when I was done with that tank and filled it up with Premium from a different station and company and then used Fuel Injection Cleaner with that tank. There is about 1/2 tank left of the second ("good gas") tank and it still knocks. Actually, it only knocks when I accelerate too fast and has a nasty quick sound when I start the car."
"I have about 30,000 miles left on the warranty from CarMax that should cover it. I'm taking it to CarMax for an oil change on Monday and will ask them to check it out (will not tell them about adding the cleaners to the gas of course). I'd like to save the engine if I can and I think they might already be using synthetic 10W30 in it for the oil changes. Yes, I change the oil every 3,000 miles regularly. Any suggestions?"
"Been using 10W30 since I bought it. Maybe I could ask about synthetic for an extra cost as long as it doesn't void my warranty. Of course, at this point it probably doesn't matter. I just hope the engine can be saved and they pay for it under warranty or just cut me a deal on a new car. This sucks because 2 years ago I wanted the 3.5L, but I also wanted burgundy. I got burgundy, but settled for the 2.7L and it looks like I'm going to pay for it now."
"What would happen if I switched to Synthetic Mobil 1 right now? Would the knocking stop or does it sound like a major engine overhaul or at least something close to that to get the gum out?"
"OK guys, the car is at Carmax and they said they can use Synthetic Mobil 1 and said that they think it only comes in 5W30 and 10W40, but I just checked the web site and it looks like it does come in 10W30. According to some of those links, it looks like I need 10W30. If they come back and say all they have is 5W30 or 10W40, what should I do?"
"OK, I don't know much about cars, but here's some bad news and good news. The bad news is the engine has heavily-scoured connecting rod bearings and heavily-scoured crankshaft (many shavings in oil pan) and Carmax says the whole engine needs replacing. If it's that bad at the bottom, then the rest of the engine is probably shot. The good news is he thinks the warranty should cover it as I change my oil every 3,000 miles (Carmax has a record of this). An insurance adjuster is coming out tomorrow morning and they think they can replace the engine before weeks end!!!"
"They just told me today the rebuilt long block and they would cover everything. Looking like they will get the car back to me on Friday. No word on the warranty yet; I forgot to ask again."
"Warranty on new engine is 3 years/36,000 miles, which goes slightly past what's left on my old warranty, which still covers the rest of the car."
"Just picked it up tonight! It sounds a lot better than it did. They actually put 10W30 regular oil in it and said to do it again after another 1,500 miles. Something about coating the new parts of the engine or something. After that, I can then switch to Synthetic Mobil 1 10W30. I'll probably still change it every 3,000 miles though. Hopefully, this engine will last a lot longer than the previous one. If I didn't have a warranty, I would have paid $1,618.76 but I only paid $25.00."
Sorry this is so long, but I wanted you to know the whole story before asking questions. Here's some questions if anyone can help:
1. Is this a bad plan?
2. Should I suggest doing something else or am I bound by their suggestions for the first 4,500 miles because of the new warranty?
3. As far as Synthetic Mobil1 5W30 vs. 10W30, what would be a good plan for this engine in light of the suggestions from Carmax?
4. What's the difference between the original engine and this rebuilt long block?
5. Anyone got any ideas on how I should care for this new engine to make it last as long as possible?