HT4100 4.1, 4.5, 4.9 Discussion, Longevity of a 4.9L Is 150K too many miles? in Cadillac Engine Technical Discussion; I was wondering what the longevity is for a 4.9L ballpark figure. I found one that I am interested in ...
I was wondering what the longevity is for a 4.9L ballpark figure. I found one that I am interested in with 150K approx. It drives smooth and everything seems Ok with the exception of a hot start issue. It is noiser than my N* Caddy but other than that it seems nice. Is this too many miles or can they go 200K + like N*s? Thanks.
I run low 15 second quarter mile times with mine at 156,500 miles. Not recomended, but they are decent engines. My transmission is another concern though.
I think my major concern for the future might be the air shocks developing leaks. Midas told me $1200 if that happens, to put in passives. My Aunt has a 1991 735, and even the BMW dealership said they "Won't" do it if that happened to their car!!! Too complex or maybe they can't get the parts?
Automobile(s): Gobi 01 Frontier/Ishi 96 Nighthawk/Gladys 94 Deville I Loved
Undisclosed location in FL
Re: Longevity of a 4.9L Is 150K too many miles?
Originally Posted by caddydaddy
I have 114,000 on my '94 4.9. And with how smooth and reliable it runs, I'm sure another 100k would be no problem for it!
I was sitting in a drive thru last night thinking the same thing , there it was running so smooth i wasnt positive it was running .....140,000 miles , only thing ive don tothe engine internally was toss some GM EOS in the crank case , between that and the delvac she runs as new ....
Trannys however im still concerned about , ive eaten mine at 130k....
with proper maintenace and a occiaional GM EOS chaser i see it running till the worlds oil reserves have run dry ....LOL
The TBI 4.5 is close enough to a 4.9. But on my 4.5 in my 89 Sedan DeVille it has 284,xxx miles (knock on wood and pray that it lives a little more). The car runs great but blows out a little bit of smoke.