Seeing as you live in Houston Glow Plugs are pretty much optional need for you anyways. They will probably last the life of the vehicle.

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2007 Grand Cherokee CRD, GDE ECO and DPF delete.
2006 CRD Limited, GDE ECO Full TQ and TCM tunes. SOLD

My 05 has 96K miles and all 4 original GP's work perfectly. I live in the mountains so we have probably have 4-5 months a year where GP's are needed.

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GDE FT Ecotune, EHM, Weeks kit stage 1 & 2, Carter 4600 lift pump, Upgraded tranny, Fishing boat hauler!
New at 164K: head gasket, rockers, exhaust valves, ARP head studs, Injectors, 5v Bosch glow plugs, water pump, timing everything, serpentine everything,
New at 225k: new head, timing belt

My 2005 just passed 150,000 miles all but one of the glow plugs are original. Only failure was around 50k. I do plug it in a lot during the winter months(Michigan), but not all the time. Of coarse now after posting how good my gp's have been, I'll probobly loose them all this winter.

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2005 CRD Midnight Blue
GDE Tune
Moog Ball Joints
No Exhaust Brake

Winter Diesel Summer Diesel

1-800-PIK-A-BIZ
Everyone's toll free number and then some

I have one more good original ceramic glow plug available.

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2006 Liberty Limited CRD, Deep Beryl Green, Yeti tune, Arp studs, new cams, rockers, lifters, TB. "Green Monster"
2005 Liberty Sport CRD, Deep Beryl Green, GDE Hot Tune, ARP studs. "Rocket"
1982 Fiat 124 Spider Convertible. "Fiona"

What is a bad GP code number?

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2006 KJ CRD Ltd - Suncoast, GDE Eco, EGR Delete, After market T-Stat, Skid Row skids, V6 airbox, 2.5" Turbo back
2005 KJ CRD Sport-Suncoast, Transco, GDE Hot-GDE Trans, EGR Delete, Skid Row skids, V6 airbox, 2.5" Turbo back, After market S-Stat
1987 Suzuki LWB Samurai -diesel powered, custom 4 link coil suspension 38.5 SX Swampers

p1260-64 i believe.

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06 CRD limited
Frankenlift, JBA 1/4 top plate, 3 clevis rings, 3 stacked iso's
JBA UCA and quick disconnects
Procomp rockkrawlr 16x8 4.25bs with 265-70-65 General Grabber AT2's
Mopar full skid plates, JCR stage 3 Rock Rails
Kenwood HU, 6.5 pioneer marine grade door speakers, JL stealthbox kenwood amp
GDE HOT tune
Soon to come
RL Rock monitor bumper

I am not sure I agree one should not be pro-active in replacements. I replaced all of mine at 99k after receiving a check engine light and confirmed faulty glow plug code at about 75k. I was able to go all spring, summer and fall with the faulty glow plug but I knew I would have trouble in winter living at high elevation.

Took it to a Jeep dealership who charged $495. A plug snapped in what was described as a "rusted" condition. Ended up having to have the head removed and machined adding $1,200 to the repair.

This experience has lead me to think that a proactive scheduled glow plug replacement program like spark plugs may be the way to go before problems develop. Also, I know that cold starting performance declined significantly well before I got a faulty glow plug code.

Also had the timing belt and water pump done by dealer. Cost: $1295.

I have 145,000 miles on my 2005, still with the original glowplugs, so far, no indication of a problem.

I have about the same mileage on my 2001 Jetta TDI, which has had all the glowplugs replaced at about 110,000 miles as a set. It also had one replaced at about 90,000 miles because the original failed, and when the second original failed, the mechanic just replaced them all.