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Thanks, I bought the car with 96k miles on it, here are the number of miles between each oil change that I did. I have been using Castrol GTX 5w30 oil with fram filters since I've owned the car at 96k..here are the oc intervals..
Engine never used any oil and level was always good and oil was never black at any oc-was dirty but not black. The car had approximately 148k when it came on the first time, my mechanic cleaned the screen, it went for 2k more miles then came on again last Monday, it has a little over 150k on it now. The only thing he did was clean the screen, nothing else.
My mechanic really has not had that much sludge experience. I've heard all of my advice mostly from this forum. I've called a Toyota dealer and they quoted me a new engine, that's it, $4500. The shop my mechanic works at sells the bg engine purge, that is how I learned about it.
I talked to my mechanic tonight and he is going to pull the valve covers off to see how bad the sludge is, then we can decide on using either the bg engine purge if the sludge isn't too bad, or the auto-rx if the sludge is really bad. That's the only thing I can come up with. He normally works on Volvos so he's seen alot of sludge, he just has not had to clean out many sludged engines, people who can afford Volvos normally just replace the engine I guess.
My fear is that we break apart the sludge too fast, then I'll be driving down the road and something would be causing the oil light not to come on, so I won't know the engine is starved, then it sieze up on me. I drive a ton, sometimes 1000 miles per week for my job. I can trade this car in right now and probably get a few thousand for it, so I just don't know what to do. If I ruin my engine with a harsh additive I'm screwed and may have an accident when I'm driving or something.