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Originally Posted by I-Love-Pontiac
I was looking at the car survey reviews, and it seems like oil loss is a common problem. Is that something that can be fixed?
And where is it going? I don't understand how you can just lose oil.
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There is an induction cleaning procedure that will clean the carbon off the piston rings...which "freeze" up and let oil pass.
There is a well known TSB for this, IMO it might have been posted either by me or one of the other tech staffers & contributors as to the service bulletin.
My store has 2 GM Master-World class technicians...once they do the cleaning procedure, they recommend a switch to Mobil 1...
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Originally Posted by YngGuyInaBuick
THe HT's did get "reliable" when they got the roller cam>>>
Our 90 Deville had the 4.5 (HT4500?) which replaced an 84 Deville that had the 4.1. Correct me if I am wrong, the HT4100s apparently suffered from major engine failures as a result of block fatigue (??) due to being one of GM's first attempts at an aluminum block. This never happened to our 4.1 which was actually a pretty dependable engine all the way up until about 120,000 miles when the car just rapidly began falling apart. We evacuated in it for hurricane Andrew which turned out to be the last long haul the car would ever make. It got us out safely and returned us home without skipping a beat, but it just wasn't the same car shortly afterwards. Various parts started going out, the interior panels were falling off, wood trim was coming unglued, headlinder fell down, transmission failed and the last straw was the timing chain failure at 136,000 miles in 1994. The car was ten years old and was a complete dinosaur compared to what was available by that time, so it was replaced by the 1990 model which was MUCH improved to say the least. There was almost no comparison between the two vehicles. I was quite surprised to learn that the 4.5 was a mere re-work of the HT4100.
The headliner, interior panels, wood trim, etc. all remained in tact in the 90... hehe.
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Block fatigue is correct...when they went ot roller cams, they "skirted"(?) the block if I said that correct?
The worse case was intake gasket failure which would go unchecked and then coolant would wash the oil out taking out the engine main & rod bearings and even the cam/lifters in or worse...