Hi Scotty, What is your opinion of the 4.0 straight 6 engine, and which is the most reliable engine?
Thanks.
AZ Joe
the reason you're not getting answers is because your title says "4.0". Try to use a better description.
The Chrysler 225ci slant six, the most dependable internal combustion for oiling your driveway.
Yeah the venerable Slant Six is a most durable engine. Having worked in the taxi business i can attest to that. Couple that engine with 6 cyl version 727 trans and you have a eng/trans setup that can out match anything during the years of its existence. Chevy 6's and V8's can't compare. Ford V8s and their 6..naw..no contest. Remember that driving a Taxi is the ultimate test for durability and longevity and include abuse as well. I was a mechanic during that era and have seen it first hand from a company which had 60 cabs to LA Yellow Cab Co which had 3000 cabs. (Los Angeles)
Hey! In the LA Cab company, did you have those 10 15 year old Ford Escape's? They seem like a very unreliable design but I see many of them on the road. What's your experience? Crown Vic can obviously run forever.
My Taxi experience was way back in the Mid 60's to about 77. Cab business has changed since then. Yellow Cab Of LA went out of business and independants took over in about 1976. Basically the City broke up LA yellow as it was a monopoly with so many cabs. They were BIG. That cab company owned a bank and a Ford Dealership. Oh the times...But much has changed because of Lyft and Uber and independents rising from the Yellow Cab which once so mighty...
Toyota 1.8 I4
and Honda 2.4 NA I4
If your are looking for inline 6, the BMW N52 has a special place in my heart. The engine itself is powerful and reliable. But the maintenance around it is expensive.
Coils cost an arm and a leg. Valve covers incorporate the PCV valve, which makes replacing the PCV valve expensive. The DISA is plastic pieces of junk which wear out. But the engine itself. Amazing.
4.0 in a Jeep. Good for 150,000 miles, then overhaul before it needs rod and main bearings.
Don't miss a shift...the shock will break a piston skirt and crack the piston up to the piston rings. Will show good compression, but engine will have a, below the head, loud knock. Usually the 2nd piston from the firewall.
Keep up with oil changes. It uses hydraulic lifters and they will sludge and fail to maintain pressure on pushrods resulting in valve train wear...tick tick tick.
